79568-28-8 Propanoic acid, 2-methyl-, (1R,2S,3S,4aR,5S,6R,8S,8aR)-8-(acetyloxy)-8a-((acetyloxy)methyl)-5-((2S,3aR,6aS)-hexahydrofuro(2,3-b)furan-2-yl)octahydro-3-hydroxy-5,6-dimethylspiro(naphthalene-1(2H),2'-oxiran)-2-yl ester