2H-3,11c-(Epoxymethano)phenanthro[10,1-bc]pyran, picras-3-en-21-oic acid deriv. 41451-75-6 BRUCEANTIN NSC 165563 NSC165563 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 [11.beta.,12.alpha.,15.beta.(E]- 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, (11.beta.,12.alpha.,15.beta.(E))- 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, [11.beta.,12.alpha.,15.beta.(E)]-