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Ruan Y, Zhu X, Shen J, Chen H, Zhou G. Mechanism of Nicotiflorin in San-Ye-Qing rhizome for anti-inflammatory effect in ulcerative colitis. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2024; 129:155564. [PMID: 38554577 DOI: 10.1016/j.phymed.2024.155564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2023] [Revised: 03/14/2024] [Accepted: 03/22/2024] [Indexed: 04/01/2024]
Abstract
BACKGROUND The incidence of ulcerative colitis (UC) is on the rise globally and the development of drugs targeting UC is urgent. Finding the target of action of natural products is important for drug discovery, elucidation of drug action mechanism, and disease mechanism. San-Ye-Qing (SYQ), is an ancient herbal medicine, but whether the powder of its rhizome has pharmacological effects against UC and its mechanism of action are not clear. PURPOSE To evaluate the therapeutic effectiveness of rhizome powder of SYQ in treating UC, and conduct an isolation and characterization of the chemical constituents of the powder. Further, screen the most potent compounds among them and determine the potential mechanism for treating UC. METHODS In vivo, the therapeutic effect of SYQ's rhizome powder on UC was assessed by mice's body weight, DAI score, colon length, tissue MPO activity, serum inflammatory markers, etc. Additionally, HPLC was used to isolate and identify the specific chemical components of SYQ's rhizome powder. Then, the most effective compounds and their therapeutic targets were analysed and screened in SYQ rhizome powder using network pharmacology, combined with CCK-8 assay, NO release assay and molecular docking assay, in conjunction with CETSA, DARTS, SPR and enzyme activity assay. Finally, the biological effects of the key compound on the targets were validated using Western blot and ELISA. RESULTS In vivo, SYQ rhizome powder effectively restored mice's body weight, lowered DAI and pathological score, downregulated the expression of inflammatory biomarkers, and restored colon length, as well as the colonic epithelial and mucus barriers. Afterward, 9 compounds were isolated and identified from the powder of the rhizomes of SYQ by HPLC. Nicotiflorin is the primary compound in SYQ with the highest concentration. According to both CCK-8 and NO release tests, Nicotiflorin is also the most efficacious compound. Combined with network pharmacological prediction, molecular docking analysis, CETSA, DARTS, SPR and enzyme activity assay, Nicotiflorin may ultimately suppress inflammation by targeting p65 and inhibiting the NF-κB pathway, thereby attenuating the activation of NLRP3 inflammasome. To verify this conclusion, Western blot and ELISA experiments were conducted. CONCLUSIONS Our results suggest that the extract from SYQ rhizomes has therapeutic properties for UC. Its active ingredient Nicotiflorin exerted potent anti-UC effects by binding to p65 and inhibiting the activation of NF-κB and NLRP3 inflammasomes.
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Affiliation(s)
- Yun Ruan
- Department of Gastroenterology, Affiliated Hospital of Nantong University, Nantong University, NO.20, Xisi Road, Nantong 226001, Jiangsu, China
| | - Xiaolin Zhu
- Department of Gastroenterology, Affiliated Hospital of Nantong University, Nantong University, NO.20, Xisi Road, Nantong 226001, Jiangsu, China
| | - Jianbo Shen
- Department of Gastroenterology, Affiliated Hospital of Nantong University, Nantong University, NO.20, Xisi Road, Nantong 226001, Jiangsu, China
| | - Hao Chen
- Department of Gastroenterology, Affiliated Hospital of Nantong University, Nantong University, NO.20, Xisi Road, Nantong 226001, Jiangsu, China.
| | - Guoxiong Zhou
- Department of Gastroenterology, Affiliated Hospital of Nantong University, Nantong University, NO.20, Xisi Road, Nantong 226001, Jiangsu, China.
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2
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Plais L, Trachsel L, Scheuermann J. Asymmetry of Dual-Display DNA-Encoded Chemical Libraries. Bioconjug Chem 2024; 35:147-153. [PMID: 38266192 DOI: 10.1021/acs.bioconjchem.3c00559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2024]
Abstract
While dual-display DNA-encoded chemical libraries (DELs) are increasingly employed for ligand discovery, some of their fundamental properties have not yet been studied in-depth. Aided with fluorescence polarization experiments, we demonstrate that dual-display DELs are intrinsically asymmetrical entities, and we deduce practical guidelines to perform better-informed on-DNA hit validation from these libraries.
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Affiliation(s)
- Louise Plais
- Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology (ETH Zürich), Vladimir-Prelog-Weg 4, CH-8093 Zürich, Switzerland
| | - Louis Trachsel
- Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology (ETH Zürich), Vladimir-Prelog-Weg 4, CH-8093 Zürich, Switzerland
| | - Jörg Scheuermann
- Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology (ETH Zürich), Vladimir-Prelog-Weg 4, CH-8093 Zürich, Switzerland
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3
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Wang H, Zhao G, Zhang T, Li Y, Zhang G, Li Y. Comparative Study of DNA Barcode Integrity Evaluation Approaches in the Early-Stage Development of DNA-Compatible Chemical Transformation. ACS Pharmacol Transl Sci 2023; 6:1724-1733. [PMID: 37974618 PMCID: PMC10644510 DOI: 10.1021/acsptsci.3c00181] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Indexed: 11/19/2023]
Abstract
DNA-encoded libraries (DEL) have emerged as an important drug discovery technical platform for target-based compound library selection. The success rate of DEL depends on both the chemical diversity of combinatorial libraries and the accuracy of DNA barcoding. Therefore, it is critical that the chemistry applied to library construction should efficiently transform on a wide range of substrates while preserving the integrity of DNA tags. Although several analytical methods have been developed to measure DNA damage caused by DEL chemical reactions, efficient and cost-effective evaluation criteria for DNA damage detection are still demanding. Herein, we set standards for evaluating the DNA compatibility of chemistry development at the laboratory level. Based on four typical DNA damage models of three different DEL formats, we evaluated the detection capabilities of four analytical methods, including ultraperformance liquid chromatography (UPLC-MS), electrophoresis, quantitative polymerase chain reaction (qPCR), and Sanger sequencing. This work systematically revealed the scope and capability of different analytical methods in assessing DNA damages caused by chemical transformation. Based on the results, we recommended UPLC-MS and qPCR as efficient methods for DNA barcode integrity analysis in the early-stage development of DNA-compatible chemistry. Meanwhile, we identified that Sanger sequencing was unreliable to assess DNA damage in this application.
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Affiliation(s)
- Huicong Wang
- Chongqing
Key Laboratory of Natural Product Synthesis and Drug Research, School
of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, P. R. China
| | - Guixian Zhao
- Chongqing
Key Laboratory of Natural Product Synthesis and Drug Research, School
of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, P. R. China
| | - Tianyang Zhang
- Chongqing
Key Laboratory of Natural Product Synthesis and Drug Research, School
of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, P. R. China
| | - Yangfeng Li
- Chongqing
Key Laboratory of Natural Product Synthesis and Drug Research, School
of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, P. R. China
- Chemical
Biology Research Center, School of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, P. R. China
| | - Gong Zhang
- Chongqing
Key Laboratory of Natural Product Synthesis and Drug Research, School
of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, P. R. China
- Chemical
Biology Research Center, School of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, P. R. China
| | - Yizhou Li
- Chongqing
Key Laboratory of Natural Product Synthesis and Drug Research, School
of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, P. R. China
- Chemical
Biology Research Center, School of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, P. R. China
- Beijing
National Laboratory for Molecular Sciences, Beijing 100190, P. R. China
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4
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Dakhel S, Galbiati A, Migliorini F, Comacchio C, Oehler S, Prati L, Scheuermann J, Cazzamalli S, Neri D, Bassi G, Favalli N. Isolation of a Natural Killer Group 2D Small-Molecule Ligand from DNA-Encoded Chemical Libraries. ChemMedChem 2022; 17:e202200350. [PMID: 35929380 DOI: 10.1002/cmdc.202200350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 08/04/2022] [Indexed: 11/11/2022]
Abstract
Natural Killer Group 2D (NKG2D) is a homo-dimeric transmembrane protein which is typically expressed on the surface of natural killer (NK) cells, natural killer T (NKT) cells, gamma delta T (γδT) cells, activated CD8 positive T-cells and activated macrophages. Bispecific molecules, capable of bridging NKG2D with a target protein expressed on the surface of tumor cells, may be used to redirect the cytotoxic activity of NK-cells towards antigen-positive malignanT-cells. In this work, we report the discovery of a novel NKG2D small molecule binder [K D = (410±60) nM], isolated from a DNA-Encoded Chemical Library (DEL). The discovery of small organic NKG2D ligands may facilitate the generation of fully synthetic bispecific adaptors, which may serve as an alternative to bispecific antibody products and which may benefit from better tumor targeting properties.
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Affiliation(s)
| | | | | | | | | | - Luca Prati
- Philogen SpA, R&D (Philochem), SWITZERLAND
| | - Jörg Scheuermann
- ETH Zürich: Eidgenossische Technische Hochschule Zurich, chemistry and applied biosciences, SWITZERLAND
| | | | | | | | - Nicholas Favalli
- Philogen SpA, R&D (Philochem), Libernstrasse 3, 8112, Otelfingen, SWITZERLAND
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5
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Badir SO, Lipp A, Krumb M, Cabrera-Afonso MJ, Kammer LM, Wu VE, Huang M, Csakai A, Marcaurelle LA, Molander GA. Photoredox-mediated hydroalkylation and hydroarylation of functionalized olefins for DNA-encoded library synthesis. Chem Sci 2021; 12:12036-12045. [PMID: 34667569 PMCID: PMC8457374 DOI: 10.1039/d1sc03191k] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Accepted: 08/04/2021] [Indexed: 12/29/2022] Open
Abstract
DNA-encoded library (DEL) technology features a time- and cost-effective interrogation format for the discovery of therapeutic candidates in the pharmaceutical industry. To develop DEL platforms, the implementation of water-compatible transformations that facilitate the incorporation of multifunctional building blocks (BBs) with high C(sp3) carbon counts is integral for success. In this report, a decarboxylative-based hydroalkylation of DNA-conjugated trifluoromethyl-substituted alkenes enabled by single-electron transfer (SET) and subsequent hydrogen atom termination through electron donor-acceptor (EDA) complex activation is detailed. In a further photoredox-catalyzed hydroarylation protocol, the coupling of functionalized, electronically unbiased olefins is achieved under air and within minutes of blue light irradiation through the intermediacy of reactive (hetero)aryl radical species with full retention of the DNA tag integrity. Notably, these processes operate under mild reaction conditions, furnishing complex structural scaffolds with a high density of pendant functional groups.
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Affiliation(s)
- Shorouk O Badir
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania 231 South 34th Street Philadelphia Pennsylvania 19104-6323 USA
| | - Alexander Lipp
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania 231 South 34th Street Philadelphia Pennsylvania 19104-6323 USA
| | - Matthias Krumb
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania 231 South 34th Street Philadelphia Pennsylvania 19104-6323 USA
| | - María Jesús Cabrera-Afonso
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania 231 South 34th Street Philadelphia Pennsylvania 19104-6323 USA
| | - Lisa Marie Kammer
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania 231 South 34th Street Philadelphia Pennsylvania 19104-6323 USA
| | - Victoria E Wu
- Encoded Library Technologies/NCE Molecular Discovery, R&D Medicinal Science and Technology, GlaxoSmithKline 200 Cambridge Park Drive Cambridge MA 02140 USA
| | - Minxue Huang
- Encoded Library Technologies/NCE Molecular Discovery, R&D Medicinal Science and Technology, GlaxoSmithKline 200 Cambridge Park Drive Cambridge MA 02140 USA
| | - Adam Csakai
- Encoded Library Technologies/NCE Molecular Discovery, R&D Medicinal Science and Technology, GlaxoSmithKline 200 Cambridge Park Drive Cambridge MA 02140 USA
| | - Lisa A Marcaurelle
- Encoded Library Technologies/NCE Molecular Discovery, R&D Medicinal Science and Technology, GlaxoSmithKline 200 Cambridge Park Drive Cambridge MA 02140 USA
| | - Gary A Molander
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania 231 South 34th Street Philadelphia Pennsylvania 19104-6323 USA
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6
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Su W, Ge R, Ding D, Chen W, Wang W, Yan H, Wang W, Yuan Y, Liu H, Zhang M, Zhang J, Shu Q, Satz AL, Kuai L. Triaging of DNA-Encoded Library Selection Results by High-Throughput Resynthesis of DNA-Conjugate and Affinity Selection Mass Spectrometry. Bioconjug Chem 2021; 32:1001-1007. [PMID: 33914520 DOI: 10.1021/acs.bioconjchem.1c00170] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
DNA encoded library (DEL) technology allows for rapid identification of novel small-molecule ligands and thus enables early-stage drug discovery. DEL technology is well-established, numerous cases of discovered hit molecules have been published, and the technology is widely employed throughout the pharmaceutical industry. Nonetheless, DEL selection results can be difficult to interpret, as library member enrichment may derive from not only desired products, but also DNA-conjugated byproducts and starting materials. Note that DELs are generally produced using split-and-pool combinatorial chemistry, and DNA-conjugated byproducts and starting materials cannot be removed from the library mixture. Herein, we describe a method for high-throughput parallel resynthesis of DNA-conjugated molecules such that byproducts, starting materials, and desired products are produced in a single pot, using the same chemical reactions and reagents as during library production. The low-complexity mixtures of DNA-conjugate are then assessed for protein binding by affinity selection mass spectrometry and the molecular weights of the binding ligands ascertained. This workflow is demonstrated to be a practical tool to triage and validate potential hits from DEL selection data.
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Affiliation(s)
- Wenji Su
- WuXi AppTec (Shanghai) Co., Ltd., 240 Hedan Road, Shanghai 200131, China
| | - Rui Ge
- WuXi AppTec (Shanghai) Co., Ltd., 240 Hedan Road, Shanghai 200131, China
| | - Duanchen Ding
- WuXi AppTec (Shanghai) Co., Ltd., 240 Hedan Road, Shanghai 200131, China
| | - Wenhua Chen
- WuXi AppTec (Shanghai) Co., Ltd., 240 Hedan Road, Shanghai 200131, China
| | - Wenqing Wang
- WuXi AppTec (Shanghai) Co., Ltd., 240 Hedan Road, Shanghai 200131, China
| | - Hao Yan
- WuXi AppTec (Shanghai) Co., Ltd., 240 Hedan Road, Shanghai 200131, China
| | - Weikun Wang
- WuXi AppTec (Shanghai) Co., Ltd., 240 Hedan Road, Shanghai 200131, China
| | - Youlang Yuan
- WuXi AppTec (Shanghai) Co., Ltd., 240 Hedan Road, Shanghai 200131, China
| | - Huan Liu
- WuXi AppTec (Shanghai) Co., Ltd., 240 Hedan Road, Shanghai 200131, China
| | - Meng Zhang
- WuXi AppTec (Shanghai) Co., Ltd., 240 Hedan Road, Shanghai 200131, China
| | - Jiyuan Zhang
- WuXi AppTec (Shanghai) Co., Ltd., 240 Hedan Road, Shanghai 200131, China
| | - Qisheng Shu
- WuXi AppTec (Shanghai) Co., Ltd., 240 Hedan Road, Shanghai 200131, China
| | - Alexander L Satz
- WuXi AppTec (Shanghai) Co., Ltd., 240 Hedan Road, Shanghai 200131, China
| | - Letian Kuai
- WuXi AppTec (Shanghai) Co., Ltd., 240 Hedan Road, Shanghai 200131, China
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7
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Onda Y, Bassi G, Elsayed A, Ulrich F, Oehler S, Plais L, Scheuermann J, Neri D. A DNA-Encoded Chemical Library Based on Peptide Macrocycles. Chemistry 2021; 27:7160-7167. [PMID: 33586277 DOI: 10.1002/chem.202005423] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Indexed: 11/07/2022]
Abstract
The synthesis and characterization of a novel DNA-encoded library of macrocyclic peptide derivatives are described; the macrocycles are based on three sets of proteinogenic and non-proteinogenic amino acid building blocks and featuring the use of copper(I)-catalyzed alkyne-azide cycloaddition (CuAAC) reaction for ring closure. The library (termed YO-DEL) which contains 1 254 838 compounds, was encoded with DNA in single-stranded format and was screened against target proteins of interest using affinity capture procedures and photocrosslinking. YO-DEL selections yielded specific binders against serum albumins, carbonic anhydrases and NKp46, a marker of activated Natural Killer cells.
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Affiliation(s)
- Yuichi Onda
- Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology (ETH Zürich), Vladimir-Prelog-Weg 4, 8093, Zürich, Switzerland
| | - Gabriele Bassi
- Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology (ETH Zürich), Vladimir-Prelog-Weg 4, 8093, Zürich, Switzerland
| | - Abdullah Elsayed
- Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology (ETH Zürich), Vladimir-Prelog-Weg 4, 8093, Zürich, Switzerland
| | - Franziska Ulrich
- Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology (ETH Zürich), Vladimir-Prelog-Weg 4, 8093, Zürich, Switzerland
| | - Sebastian Oehler
- Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology (ETH Zürich), Vladimir-Prelog-Weg 4, 8093, Zürich, Switzerland
| | - Louise Plais
- Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology (ETH Zürich), Vladimir-Prelog-Weg 4, 8093, Zürich, Switzerland
| | - Jörg Scheuermann
- Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology (ETH Zürich), Vladimir-Prelog-Weg 4, 8093, Zürich, Switzerland
| | - Dario Neri
- Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology (ETH Zürich), Vladimir-Prelog-Weg 4, 8093, Zürich, Switzerland
- Philochem AG, Libernstrasse 3, 8112, Otelfingen, Switzerland
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8
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Catalano M, Bassi G, Rotondi G, Khettabi L, Dichiara M, Murer P, Scheuermann J, Soler-Lopez M, Neri D. Discovery, affinity maturation and multimerization of small molecule ligands against human tyrosinase and tyrosinase-related protein 1. RSC Med Chem 2020; 12:363-369. [PMID: 34041485 PMCID: PMC8130610 DOI: 10.1039/d0md00310g] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Human tyrosinase (hTYR) and tyrosinase-related protein 1 (hTYRP1) are closely-related enzymes involved in the synthesis of melanin, which are selectively expressed in melanocytes and, in a pathological context, in melanoma lesions. We used a previously described tyrosinase inhibitor (Thiamidol™) and DNA-encoded library technology for the discovery of novel hTYR and hTYRP1 ligands, that could be used as vehicles for melanoma targeting. Performing de novo selections with DNA-encoded libraries, we discovered novel ligands capable of binding to both hTYR and hTYRP1. More potent ligands were obtained by multimerizing Thiamidol™ moieties, leading to homotetrameric structures that avidly bound to melanoma cells, as revealed by flow cytometry. These findings suggest that melanoma lesions may, in the future, be targeted not only by monoclonal antibody reagents but also by small organic ligands. A series of different strategies were oriented toward the discovery of small molecule ligands binding to the human version of tyrosinase (hTYR) and tyrosinase-related protein 1 (hTYRP1), which may represent the basis for novel treatments of melanoma.![]()
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Affiliation(s)
- Marco Catalano
- Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology (ETH Zürich) Vladimir-Prelog-Weg 4 CH-8093 Zürich Switzerland
| | - Gabriele Bassi
- Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology (ETH Zürich) Vladimir-Prelog-Weg 4 CH-8093 Zürich Switzerland
| | - Giulia Rotondi
- Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology (ETH Zürich) Vladimir-Prelog-Weg 4 CH-8093 Zürich Switzerland .,Dipartimento di Chimica e Tecnologie del Farmaco, Sapienza University of Rome P.le A. Moro 5 00185 Rome Italy
| | - Lyna Khettabi
- Structural Biology Group, European Synchrotron Radiation Facility 71 Avenue des Martyrs 38000 Grenoble France.,CNRS, DCM, Université Grenoble Alpes 38000 Grenoble France
| | - Maria Dichiara
- Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology (ETH Zürich) Vladimir-Prelog-Weg 4 CH-8093 Zürich Switzerland
| | - Patrizia Murer
- Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology (ETH Zürich) Vladimir-Prelog-Weg 4 CH-8093 Zürich Switzerland
| | - Jörg Scheuermann
- Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology (ETH Zürich) Vladimir-Prelog-Weg 4 CH-8093 Zürich Switzerland
| | - Montserrat Soler-Lopez
- Structural Biology Group, European Synchrotron Radiation Facility 71 Avenue des Martyrs 38000 Grenoble France
| | - Dario Neri
- Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology (ETH Zürich) Vladimir-Prelog-Weg 4 CH-8093 Zürich Switzerland
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