Synonyms: AC1L4HZI;80108-36-7;Picras-3-en-21-oic acid, 3,3'-((1,4-dioxo-1,4-butanediyl)bis(oxy))bis(13,20-epoxy-11,12-dihydroxy-15-((3-methyl-1-oxo-2-butenyl)oxy)-2,16-dioxo-, dimethyl ester, (11beta,12alpha,13beta,15beta)-(11'beta,12'beta,13'beta,15'beta)-