2472-36-8 D:A-Friedo-24-noroleana-1,3,5(10),7-tetraen-29-oic acid, 2,3-bis(acetyloxy)-, methyl ester, (20alpha)- Methyl (20alpha)-2,3-bis(acetyloxy)-D:A-friedo-24-noroleana-1,3,5(10),7-tetraen-29-oate