Synonyms: 2H-3,11cb-(Epoxymethano)phenanthro[10,1-bc]pyran-3a(1H)-carboxylic acid, 3a,4,5,6ab,7,7aa,8,9,10,11,11a,11ba-dodecahydro-1b,2a,4b,9-tetrahydroxy-8,11ab-dimethyl-5,10-dioxo-, methylester, 4-acetate (8CI); 2H-3,11c-(Epoxymethano)phenanthro[10,1-bc]pyran,picrasan-21-oic acid deriv.; Bruceine B, dihydro-