Synonyms: AC1L4IWK;81612-59-1;Picras-3-en-21-oic acid, 3,3'-((1,4-dioxo-1,4-butanediyl)bis(oxy))bis(12-(acetyloxy)-13,20-epoxy-11-hydroxy-15-((3-methyl-1-oxo-2-butenyl)oxy)-2,16-dioxo-, dimethyl ester, (11beta,12alpha,15beta)-(11'beta,12'alpha,15'beta)-