methyl 2-((1R,3aR,6aR)-1-(2-hydroxyethyl)-2,2-dimethyl-4-methylene-5-oxohexahydropentalen-3a(1H)-yl)acetate

methyl (1R*,3aR*,4S*,6aR*)-2,2-dimethyl-2,3,3a,4,6,6a-hexahydro-5-oxo-4-phenylthiomethyl-1-(2-tetrahydropyranyloxy)ethyl-3a(1H)pentaleneacetate