Synonyms: D:A-Friedooleanane-3,16-dione(8CI); 3,16-Dioxofriedelane; 3,8(2H,4H)-Picenedione,octadecahydro-4,4a,6b,8a,11,11,12b,14a-octamethyl-,(4R,4aS,6aS,6bR,8aS,12aS,12bS,14aS,14bS)-; Maytensifolin B; [4R-(4a,4aa,6ab,6ba,8aa,12aa,12bb,14aa,14bb)]-Octadecahydro-4,4a,6b,8a,11,11,12b,14a-octamethyl-3,8(2H,4H)-picenedione