New sesquiterpene and flavone arabinofuranoside derivative from the leaves of Fissistigma bicolor

Chryroxosides A-E: five new triterpene saponins from the leaves of Chrysophyllum roxburghii G.Don. and their cytotoxic activity

Five undescribed oleanane triterpene glycosides named chryroxosides A-D (1-5), together with five known compounds (6-10) were isolated from the leaves of Chrysophyllum roxburghii G.Don. Their chemical structures were elucidated by extensive spectroscopic data analyses including IR, HR-ESI-MS, 1D and 2D NMR). Compounds 1, 3, and 5 showed cytotoxic effects against KB, HepG2, HL60, P388, HT29, and MCF7 cell lines with the IC50 values ranging from 14.40 to 52.63 μM compared to the positive control compound (ellipticine) with the IC50 values ranging from 1.34 to 1.99 μM.

Two new chlorinated sesquiterpenes from Sigesbeckia orientalis

Two new chlorinated guaianane-type sesquiterpenes (named chlosigesolides A and B) together with eight known compounds were isolated from the leaves and twigs of Sigesbeckia orientalis. Their structures were determined by analysis of HR-ESI-MS, 1D- and 2D-NMR spectral data as well as comparison with the literature. Absolute configurations of new compounds were elucidated by NOESY and ECD methods. Chlosigesolide A inhibited NO production in LPS-stimulated RAW264.7 macrophages with IC50 value of 10.9 ± 0.8 μM. Other compounds exhibited inhibitory activity at IC50 in range of 26.5 to 49.7 μM.