2H-3,11c-(Epoxymethano)phenanthro(10,1-bc)pyran, picras-3-en-21-oic acid deriv. (9CI) 41451-75-6 BRUCEANTIN NSC 165563 NSC-165563 Picras-3-en-21-oic acid, 15-((3,4-dimethyl-1-oxo-2-pentenyl)oxy)-13,20-epoxy-3,11,12-trihydroxy-2,16-dioxo-, methyl ester, (11beta,12alpha,15beta(E))- (9CI)