Synonyms: 2H-3,11cb-(Epoxymethano)phenanthro[10,1-bc]pyran-3a(1H)-carboxylic acid, 3a,4,5,6ab,7,7aa,10,11,11a,11ba-decahydro-1b,2a,4b,9-tetrahydroxy-8,11ab-dimethyl-5,10-dioxo-, methylester, 4-(4-hydroxy-3,4-dimethyl-2-pentenoate) (8CI); Picras-3-en-21-oic acid,13,20-epoxy-3,11,12-trihydroxy-15-[(4-hydroxy-3,4-dimethyl-1-oxo-2-pentenyl)oxy]-2,16-dioxo-,methyl ester, [11b,12a,15b(E)]-; Picras-3-en-21-oic acid,13,20-epoxy-3,11,12-trihydroxy-15-[[(2E)-4-hydroxy-3,4-dimethyl-1-oxo-2-pentenyl]oxy]-2,16-dioxo-,methyl ester, (11b,12a,15b)- (9CI); Bruceine C; NSC 305730