Synonyms: Picras-3-en-21-oic acid,13,20-epoxy-2-(a-D-glucopyranosyloxy)- 1,11,12-trihydroxy-15-[(3-methyl-1-oxo-2- butenyl)oxy]-16-oxo-,methyl ester,(1a,2R,11a,12R,15a)-;Picras-3-en-21-oic acid, 13,20-epoxy-3-(.beta.-D-glucopyranosyloxy)-1,11,12-trihydroxy-15-[(3-methyl-1-oxy-2-butenyl)oxy]-16-oxo-, methyl ester, (1.beta.,11.beta.,12.alpha.,15.beta.)-;