4-21-00-06539 (Beilstein Handbook Reference) 67806-01-3 7,20-Cycloveatchan-12-one, 1,5-bis(acetyloxy)-21-ethyl-4-methyl-16-methylene-, (1-alpha,15-beta)- BRN 0063084 Di-O-acetylsongorine Songorine diacetate