FOUR NEW CANTHARIDIN DERIVATIVES FROM THE CHINESE BLISTER BEETLES, MYLABRIS PHALERATA

摘要

Four new cantharidin derivatives, cantharacidines A-D (1-4) were isolated from the Chinese blister beetles Mylabris phalerata. Their structures with absolute configurations were elucidated by means of NMR spectroscopy, single-crystal X-ray diffraction and electronic circular dichroism (ECD) spectral analyses. Compounds 1-3 are the first examples of natural cantharimide-carboxylic acid adducts. The inhibitory effects of compounds 1-4 on the viability of three cancer cell lines (HepG2, MDA-MB-231 and A549 cells) were evaluated by the MTT assay.