1
|
Millimaci AM, Knirsch AC, Beeler AB. Regioselective Photoredox Catalyzed Cycloadditions of Acyclic Carbonyl Ylides. Org Lett 2024; 26:7484-7488. [PMID: 39231246 DOI: 10.1021/acs.orglett.4c02126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/06/2024]
Abstract
A photoredox catalyzed [3 + 2] dipolar cycloaddition between acyclic carbonyl ylides generated from α-cyano epoxides and dipolarophiles is described. This method, influenced by anionic charge localization and temperature control, enabled the synthesis of regioselective functionalized cyclic ethers. By leveraging different dipolarophiles, Lewis acid mediated activation afforded either furan or hydroxy-dihydronaphthalene scaffolds. A direct synthesis of lignan natural products isodiphyllin and diphyllin is achieved by exploiting the nitrile's reactivity as a directing handle for the desired regioisomer.
Collapse
Affiliation(s)
- Alexandra M Millimaci
- Department of Chemistry, Boston University, Boston, Massachusetts 02215, United States
| | - Antonin C Knirsch
- Department of Chemistry, Boston University, Boston, Massachusetts 02215, United States
| | - Aaron B Beeler
- Department of Chemistry, Boston University, Boston, Massachusetts 02215, United States
| |
Collapse
|
2
|
Lignans from the genus Piper L. and their pharmacological activities: An updated review. Fitoterapia 2023; 165:105403. [PMID: 36577457 DOI: 10.1016/j.fitote.2022.105403] [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: 10/27/2022] [Revised: 12/21/2022] [Accepted: 12/22/2022] [Indexed: 12/26/2022]
Abstract
The genus Piper, a member of the Piperaceae family, comprises >2000 species, of which many are well known to possess considerable economic and medicinal values. Lignans are essential ingredients and are rich in Piper plants. Although many phytochemical studies have reported many lignans identified from Piper plants, comprehensive research has not reviewed these compounds. Hence, the present review reports on natural lignans from the genus Piper and their pharmacological activities. At least 275 lignans have been discovered from the Piper genus until October 2022, including traditional lignans, neolignans, oxyneolignans, norlignans, secolignans, and polyneolignans, especially some neolignans and norlignans with novel and complex scaffolds. In addition, these lignans have been reported to show various pharmacological activities, such as antimicrobial, anti-inflammatory, neuroprotective, antioxidative, anti-platelet aggregation, cytotoxic, anti-parasitic, CYP3A4 inhibitory activities, and so on. The current work presents an up-to-date critical review and a systematic summary of publications on lignans from the genus Piper to lay the groundwork and show better insights for further investigations.
Collapse
|
3
|
Wang CY, Qin F, Wang CG, Kim D, Li JJ, Chen XL, Wang HS, Lee SK. Novel lignans from Zanthoxylum nitidum and antiproliferation activity of sesaminone in osimertinib-resistant non-small cell lung cancer cells. Bioorg Chem 2023; 134:106445. [PMID: 36893545 DOI: 10.1016/j.bioorg.2023.106445] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 11/14/2022] [Accepted: 02/22/2023] [Indexed: 02/27/2023]
Abstract
Seven previously undescribed tetrahydrofuran lignans with different configurations and unusual isopentenyl substitutions, nitidumlignans D-J (corresponding to compounds 1, 2, 4, 6, 7, 9 and 10), along with 14 known lignans, were isolated from Zanthoxylum nitidum. Notably, compound 4 is an uncommon naturally occurring furan-core lignan derived from tetrahydrofuran aromatization. The antiproliferation activity of the isolated compounds (1-21) was determined in various human cancer cell lines. The structure-activity study revealed that the steric positioning and chirality of the lignans exert important effects on their activity and selectivity. In particular, compound 3 (sesaminone) exhibited potent antiproliferative activity in cancer cells, including acquired osimertinib-resistant non-small-cell lung cancer (HCC827-osi) cells. Compound 3 also inhibited colony formation and induced the apoptotic death of HCC827-osi cells. The underlying molecular mechanisms revealed that 3 downregulated the activation of the c-Met/JAK1/STAT3 and PI3K/AKT/mTOR signaling pathways in the HCC827-osi cells. In addition, the combination of 3 and osimertinib exhibited synergistic effects on the antiproliferative activity against HCC827-osi cells. Overall, these findings inform the structure elucidation of novel lignans isolated from Z. nitidum, and sesaminone was identified as a potential compound for exerting antiproliferative effects on osimertinib-resistant lung cancer cells.
Collapse
Affiliation(s)
- Cai Yi Wang
- Natural Products Research Institute, College of Pharmacy, Seoul National University, Seoul 08826, Republic of Korea
| | - Feng Qin
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Collaborative Innovation Center for Guangxi Ethnic Medicine, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, China
| | - Chun-Gu Wang
- Pharmaceutical Research Center and School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China
| | - Donghwa Kim
- Natural Products Research Institute, College of Pharmacy, Seoul National University, Seoul 08826, Republic of Korea
| | - Jin-Jun Li
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Collaborative Innovation Center for Guangxi Ethnic Medicine, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, China
| | - Xian-Lan Chen
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Collaborative Innovation Center for Guangxi Ethnic Medicine, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, China
| | - Heng-Shan Wang
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Collaborative Innovation Center for Guangxi Ethnic Medicine, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, China.
| | - Sang Kook Lee
- Natural Products Research Institute, College of Pharmacy, Seoul National University, Seoul 08826, Republic of Korea.
| |
Collapse
|
4
|
Marques AM, da Rocha Queiroz AS, Guimarães EF, Mafud AC, de Sousa Carvalho P, Mascarenhas YP, da Silva Barenco T, Souza PDN, Provance DW, do Nascimento JHM, Ponte CG, Kaplan MAC, de Lima Moreira D, Figueiredo MR. Piper tectoniifolium Kunth: A New Natural Source of the Bioactive Neolignan (-)-Grandisin. Molecules 2022; 27:molecules27041151. [PMID: 35208941 PMCID: PMC8876808 DOI: 10.3390/molecules27041151] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Revised: 01/28/2022] [Accepted: 01/30/2022] [Indexed: 11/29/2022] Open
Abstract
The Piper species are a recognized botanical source of a broad structural diversity of lignans and its derivatives. For the first time, Piper tectoniifolium Kunth is presented as a promising natural source of the bioactive (−)-grandisin. Phytochemical analyses of extracts from its leaves, branches and inflorescences showed the presence of the target compound in large amounts, with leaf extracts found to contain up to 52.78% in its composition. A new HPLC-DAD-UV method was developed and validated to be selective for the identification of (−)-grandisin being sensitive, linear, precise, exact, robust and with a recovery above 90%. The absolute configuration of the molecule was determined by X-ray diffraction. Despite the identification of several enantiomers in plant extracts, the major isolated substance was characterized to be the (−)-grandisin enantiomer. In vascular reactivity tests, it was shown that the grandisin purified from botanical extracts presented an endothelium-dependent vasorelaxant effect with an IC50 of 9.8 ± 1.22 μM and around 80% relaxation at 30 μM. These results suggest that P. tectoniifolium has the potential to serve as a renewable source of grandisin on a large scale and the potential to serve as template for development of new drugs for vascular diseases with emphasis on disorders related to endothelial disfunction.
Collapse
Affiliation(s)
- André M. Marques
- Departament of Natural Products, Pharmaceutical Technology Institute, Far-Manguinhos, Fiocruz, Sizenando Nabuco 100 St, Manguinhos, Rio de Janeiro 21041-250, RJ, Brazil; (A.M.M.); (M.R.F.)
| | - Alexandre Siqueira da Rocha Queiroz
- Health Sciences Center, Natural Produts Research Institut (IPPN), Federal University of Rio de Janeiro, Block H-1° Floor, Rio de Janeiro 21941-590, RJ, Brazil; (A.S.d.R.Q.); (M.A.C.K.)
| | - Elsie F. Guimarães
- Botanical Garden Research Institute of Rio de Janeiro, Pacheco Leão 915 St, Jardim Botânico, Rio de Janeiro 22460-030, RJ, Brazil;
| | - Ana Carolina Mafud
- Physics Institute of São Carlos, Universidade de São Paulo, Trabalhador São-Carlense, Av. n° 400, São Carlos 13566-590, SP, Brazil; (A.C.M.); (P.d.S.C.); (Y.P.M.)
| | - Paulo de Sousa Carvalho
- Physics Institute of São Carlos, Universidade de São Paulo, Trabalhador São-Carlense, Av. n° 400, São Carlos 13566-590, SP, Brazil; (A.C.M.); (P.d.S.C.); (Y.P.M.)
| | - Yvonne Primerano Mascarenhas
- Physics Institute of São Carlos, Universidade de São Paulo, Trabalhador São-Carlense, Av. n° 400, São Carlos 13566-590, SP, Brazil; (A.C.M.); (P.d.S.C.); (Y.P.M.)
| | - Thais da Silva Barenco
- Nucleus of Applied Biomedical Sciences—Federal Institute of Rio de Janeiro (IFRJ), Rio de Janeiro 20270-021, RJ, Brazil; (T.d.S.B.); (P.D.N.S.); (C.G.P.)
| | - Pâmella Dourila N. Souza
- Nucleus of Applied Biomedical Sciences—Federal Institute of Rio de Janeiro (IFRJ), Rio de Janeiro 20270-021, RJ, Brazil; (T.d.S.B.); (P.D.N.S.); (C.G.P.)
| | - David William Provance
- Center for Technological Development in Health, Laboratory of Interdisciplinary Medical Research, Oswaldo Cruz Foundation, Rio de Janeiro 21040-361, RJ, Brazil;
| | - José Hamilton M. do Nascimento
- Laboratory of Cardiac Electrophysiology Antonio Paes de Carvalho, Carlos Chagas Filho Institute of Biophysics—Federal University of Rio de Janeiro, Rio de Janeiro 21941-902, RJ, Brazil;
| | - Cristiano G. Ponte
- Nucleus of Applied Biomedical Sciences—Federal Institute of Rio de Janeiro (IFRJ), Rio de Janeiro 20270-021, RJ, Brazil; (T.d.S.B.); (P.D.N.S.); (C.G.P.)
| | - Maria Auxiliadora C. Kaplan
- Health Sciences Center, Natural Produts Research Institut (IPPN), Federal University of Rio de Janeiro, Block H-1° Floor, Rio de Janeiro 21941-590, RJ, Brazil; (A.S.d.R.Q.); (M.A.C.K.)
| | - Davyson de Lima Moreira
- Departament of Natural Products, Pharmaceutical Technology Institute, Far-Manguinhos, Fiocruz, Sizenando Nabuco 100 St, Manguinhos, Rio de Janeiro 21041-250, RJ, Brazil; (A.M.M.); (M.R.F.)
- Botanical Garden Research Institute of Rio de Janeiro, Pacheco Leão 915 St, Jardim Botânico, Rio de Janeiro 22460-030, RJ, Brazil;
- Correspondence:
| | - Maria Raquel Figueiredo
- Departament of Natural Products, Pharmaceutical Technology Institute, Far-Manguinhos, Fiocruz, Sizenando Nabuco 100 St, Manguinhos, Rio de Janeiro 21041-250, RJ, Brazil; (A.M.M.); (M.R.F.)
| |
Collapse
|
5
|
Jo YH, Lee S, Yeon SW, Turk A, Lee JH, Hong SM, Han YK, Lee KY, Hwang BY, Kim SY, Lee MK. Anti-diabetic potential of Masclura tricuspidata leaves: Prenylated isoflavonoids with α-glucosidase inhibitory and anti-glycation activity. Bioorg Chem 2021; 114:105098. [PMID: 34153812 DOI: 10.1016/j.bioorg.2021.105098] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Revised: 06/10/2021] [Accepted: 06/12/2021] [Indexed: 01/20/2023]
Abstract
Investigation of chemical constituents of Masclura tricuspidata leaves resulted in the isolation of 47 isoflavonoids possessing prenyl groups with different numbers and structures. Among them, sixteen compounds named cudracusisoflavones A-P (1-16) were first isolated from nature. The isoflavonoids isolated from M. tricuspidata leaves showed anti-diabetic effects as measured by inhibition on α-glucosidase activity and advanced glycation end-products (AGEs) formations. Especially, cudracusisoflavone L (12), a new compound, together with gancaonin M (27), erysenegalensein E (41) and millewanin G (44) showed strong α-glucosidase inhibition with IC50 values <10.0 μM. In addition, cudracusisoflavones A (1), D (4), M (13) and N (14), together with known prenylated isoflavonoids efficiently inhibited methylglyoxal (MGO)- or glyoxal (GO)-induced AGE formations. Structure activity relationship together with molecular docking analysis suggested the importance of hydroxy group and linear type of prenyl moiety for α-glucosidase inhibition. Conclusively, diverse prenylated isoflavonoids in M. tricuspidata leaves might ameliorate glycotoxicity-induced metabolic diseases.
Collapse
Affiliation(s)
- Yang Hee Jo
- College of Pharmacy, Chungbuk National University, Cheongju 28160, Republic of Korea
| | - Solip Lee
- College of Pharmacy, Chungbuk National University, Cheongju 28160, Republic of Korea
| | - Sang Won Yeon
- College of Pharmacy, Chungbuk National University, Cheongju 28160, Republic of Korea
| | - Ayman Turk
- College of Pharmacy, Chungbuk National University, Cheongju 28160, Republic of Korea
| | - Jae Hyuk Lee
- College of Pharmacy, Gachon University, Incheon 21936, Republic of Korea
| | - Seong-Min Hong
- College of Pharmacy, Gachon University, Incheon 21936, Republic of Korea
| | - Yoo Kyong Han
- College of Pharmacy, Korea University, Sejong 47236, Republic of Korea
| | - Ki Yong Lee
- College of Pharmacy, Korea University, Sejong 47236, Republic of Korea
| | - Bang Yeon Hwang
- College of Pharmacy, Chungbuk National University, Cheongju 28160, Republic of Korea
| | - Sun Yeou Kim
- College of Pharmacy, Gachon University, Incheon 21936, Republic of Korea
| | - Mi Kyeong Lee
- College of Pharmacy, Chungbuk National University, Cheongju 28160, Republic of Korea.
| |
Collapse
|
6
|
Ramírez J, Andrade MD, Vidari G, Gilardoni G. Essential Oil and Major Non-Volatile Secondary Metabolites from the Leaves of Amazonian Piper subscutatum. PLANTS (BASEL, SWITZERLAND) 2021; 10:1168. [PMID: 34207495 PMCID: PMC8228786 DOI: 10.3390/plants10061168] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Revised: 06/01/2021] [Accepted: 06/06/2021] [Indexed: 11/16/2022]
Abstract
The essential oil and the major non-volatile secondary metabolites from the leaves of Piper subscutatum (Miq.) C. DC. (Family Piperaceae), collected in the Ecuadorian Amazon, were analyzed for the first time in the present study. The essential oil was submitted to chemical and enantioselective analyses by GC-MS and GC-FID. (E)-β-caryophyllene (25.3-25.2%), β-chamigrene (10.3-7.8%), (E)-nerolidol (8.1-7.7%), β-selinene (7.2-7.7%), δ-cadinene (2.7-3.9%), bicyclogermacrene (3.7-2.4%), and β-pinene (2.6-3.4%) were the major components. The enantioselective analysis, carried out on a β-cyclodextrin-based column, showed four scalemic mixtures in which (1R,5R)-(+)-α-pinene, (1S,5S)-(-)-β-pinene, (S)-(-)-limonene, and (1R,2S,6S,7S,8S)-(-)-α-copaene were the major enantiomers, with enantiomeric excesses of 28.8%, 77.8%, 18.4%, and 6.0%, respectively. The study was complemented with the chemical analysis of the organic fraction dissolved in the hydrolate, whose major components were 6-methyl-5-hepten-2-one (63.7-64.4%) and linalool (6.5-6.0%). Concerning the non-volatile fraction, five lignans were the major components. (-)-Beilshminol B, (-)-grandisin, (-)-3',4'-methylenedioxy-3,4,5-trimethoxy-7,7'-epoxylignan, (-)-3',4'-methylenedioxy-3,4,5,5'-tetramethoxy-7,7'-epoxylignan, and (-)-3,4,3',4'-dimethylenedioxy-5,5'-dimethoxy-7,7'-epoxylignan were identified by means of NMR spectroscopy, mass spectrometry and X-ray crystallography. The absolute configuration 7S,8S,7'S,8'S was tentatively assigned to all of them.
Collapse
Affiliation(s)
- Jorge Ramírez
- Departamento de Química, Universidad Técnica Particular de Loja, Calle M. Champagnat s/n, Loja 1101608, Ecuador; (J.R.); (M.D.A.)
- Dipartimento di Chimica, Università degli Studi di Pavia, Via Taramelli 10, 27100 Pavia, Italy;
| | - María Daniela Andrade
- Departamento de Química, Universidad Técnica Particular de Loja, Calle M. Champagnat s/n, Loja 1101608, Ecuador; (J.R.); (M.D.A.)
| | - Giovanni Vidari
- Dipartimento di Chimica, Università degli Studi di Pavia, Via Taramelli 10, 27100 Pavia, Italy;
- Medical Analysis Department, Faculty of Science, Tishk International University, Erbil 44001, Iraq
| | - Gianluca Gilardoni
- Departamento de Química, Universidad Técnica Particular de Loja, Calle M. Champagnat s/n, Loja 1101608, Ecuador; (J.R.); (M.D.A.)
| |
Collapse
|
7
|
Peppers: A "Hot" Natural Source for Antitumor Compounds. Molecules 2021; 26:molecules26061521. [PMID: 33802144 PMCID: PMC8002096 DOI: 10.3390/molecules26061521] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Revised: 03/05/2021] [Accepted: 03/07/2021] [Indexed: 12/20/2022] Open
Abstract
Piper, Capsicum, and Pimenta are the main genera of peppers consumed worldwide. The traditional use of peppers by either ancient civilizations or modern societies has raised interest in their biological applications, including cytotoxic and antiproliferative effects. Cellular responses upon treatment with isolated pepper-derived compounds involve mechanisms of cell death, especially through proapoptotic stimuli in tumorigenic cells. In this review, we highlight naturally occurring secondary metabolites of peppers with cytotoxic effects on cancer cell lines. Available mechanisms of cell death, as well as the development of analogues, are also discussed.
Collapse
|
8
|
Vu VT, Chen XL, Kong LY, Luo JG. Melipatulinones A–C, Three Lignan–Phloroglucinol Hybrids from Melicope patulinervia. Org Lett 2020; 22:1380-1384. [DOI: 10.1021/acs.orglett.9b04680] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Van-Tuan Vu
- Jiangsu Key Laboratory of Bioactive Natural Product Research and State Key Laboratory of Natural Medicines, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 210009, People’s Republic of China
| | - Xin-Lin Chen
- Jiangsu Key Laboratory of Bioactive Natural Product Research and State Key Laboratory of Natural Medicines, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 210009, People’s Republic of China
| | - Ling-Yi Kong
- Jiangsu Key Laboratory of Bioactive Natural Product Research and State Key Laboratory of Natural Medicines, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 210009, People’s Republic of China
| | - Jian-Guang Luo
- Jiangsu Key Laboratory of Bioactive Natural Product Research and State Key Laboratory of Natural Medicines, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 210009, People’s Republic of China
| |
Collapse
|
9
|
Alfonzo E, Beeler AB. A sterically encumbered photoredox catalyst enables the unified synthesis of the classical lignan family of natural products. Chem Sci 2019; 10:7746-7754. [PMID: 31588322 PMCID: PMC6761868 DOI: 10.1039/c9sc02682g] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2019] [Accepted: 06/30/2019] [Indexed: 11/21/2022] Open
Abstract
Herein, we detail a unified synthetic approach to the classical lignan family of natural products that hinges on divergence from a common intermediate that was strategically identified from nature's biosynthetic blueprints. Efforts toward accessing the common intermediate through a convergent and modular approach resulted in the discovery of a sterically encumbered photoredox catalyst that can selectively generate carbonyl ylides from electron-rich epoxides. These can undergo concerted [3 + 2] dipolar cycloadditions to afford tetrahydrofurans, which were advanced (2-4 steps) to at least one representative natural product or natural product scaffold within all six subtypes in classical lignans. The application of those synthetic blueprints to the synthesis of heterolignans bearing unnatural functionality was demonstrated, which establishes the potential of this strategy to accelerate structure-activity-relationship studies of these natural product frameworks and their rich biological activity.
Collapse
Affiliation(s)
- Edwin Alfonzo
- Department of Chemistry , Boston University , Boston , Massachusetts 02215 , USA .
| | - Aaron B Beeler
- Department of Chemistry , Boston University , Boston , Massachusetts 02215 , USA .
| |
Collapse
|
10
|
Jagtap PR, Císařová I, Jahn U. Bioinspired total synthesis of tetrahydrofuran lignans by tandem nucleophilic addition/redox isomerization/oxidative coupling and cycloetherification reactions as key steps. Org Biomol Chem 2018; 16:750-755. [DOI: 10.1039/c7ob02848b] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Three steps suffice to complete a bioinspired total synthesis of tetrahydrofuran lignans using tandem addition/isomerization/dimerization and cycloetherification reactions.
Collapse
Affiliation(s)
- Pratap R. Jagtap
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences
- 166 10 Prague
- Czech Republic
| | - Ivana Císařová
- Department of Inorganic Chemistry
- Charles University in Prague
- 12843 Prague 2
- Czech Republic
| | - Ullrich Jahn
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences
- 166 10 Prague
- Czech Republic
| |
Collapse
|