Synonyms: BRUCEIN A;Methyl (11beta,12alpha,15beta)-3,11,12-trihydroxy-15-[(3-methylbutanoyl)oxy]-2,16-dioxo-13,20-epoxypicras-3-en-21-oate;picras-3-en-21-oic acid, 13,20-epoxy-3,11,12-trihydroxy-15-(3-methyl-1-oxobutoxy)-2,16-dioxo-, methyl ester, (11beta,12alpha,15beta)-