87441-78-9 Butanoic acid, 2-methyl-, (1R,2S,3R,4aR,5S,6R,8S,8aR)-8-(acetyloxy)-8a-((acetyloxy)methyl)octahydro-3-hydroxy-5,6-dimethyl-5-((2S,3aS,6aS)-2,3,3a,6a-tetrahydrofuro(2,3-b)furan-2-yl)spiro(naphthalene-1(2H),2'-oxiran)-2-yl ester