Synonyms: 81612-57-9;AC1L4IWE;bis{11,12-dihydroxy-21-methoxy-15-[(3-methylbutanoyl)oxy]-2,16,21-trioxo-13,20-epoxypicras-3-en-3-yl} butanedioate;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-oxobutoxy)-2,16-dioxo-, dimethyl ester, (11beta,12alpha,15beta)-(11'beta,12'alpha,15'beta)-