Synonyms: 18-Nor-16-oxaandrostane-8-carboxaldehyde,6-(acetyloxy)-15-hydroxy-4,4-dimethyl-17-oxo-7-(1-oxobutoxy)-, cyclic8,15-hemiacetal, (5a,6a,7a,13a,15b)-; Aplyroseol 4; Butanoic acid,12-(acetyloxy)tetradecahydro-10-hydroxy-1,1,4a-trimethyl-7-oxo-2H,10H-furo[2,3,4-cd]naphth[2,1-e]isobenzofuran-11-ylester, (4aR,4bR,6aR,8aR,10aS,10bR,11S,12R,12aS)-[partial]-