141271-79-6 Bruceoside C Picras-3-en-21-oic acid, 13,20-epoxy-3-(beta-D-glucopyranosyloxy)-11,12-dihydroxy-6-((3-methyl-1-oxo-2-butenyl)oxy)-2,16-dioxo-, methyl ester, (6alpha,11beta,12alpha)-