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Five new phenolic compounds rynchopeterines A-E ( 1 - 5 ), in addition to thirteen known phenolics, were isolated from Blaps rynchopetera Fairmaire, a kind of medicinal insect utilized by the Yi Nationality in Yunnan Province of China. Their structures were established on the basis of extensive spectroscopic analyses (1D and 2D NMR, HR-MS, IR) along with calculated electronic circular dichroism method. Rynchopeterines A-E ( 1 - 4 ) exhibited significant antioxidant activities with IC 50 values of 7.67-12.3 μg/mL measured by the 1,1-diphenyl-2-picrylhydrazyl (DPPH) assay. Besides, rynchopeterines B ( 2 ) and C ( 3 ) showed mild cytotoxicity against tumor cell Caco-2 and A549.

Five New Phenolic Compounds with Antioxidant Activities from the Medicinal Insect Blaps rynchopetera