methyl (1S,2R,3R,5S,7EZ)-3-acetoxy-7-acetoxymethylenebicyclo<3.3.0>octane-2-carboxylate

methyl (1S,6S,7R,8R)-8-acetoxybicyclo<4.3.0>non-3-ene-7-carboxylate

(1R,2R,3aS,7aS)-2-Hydroxy-2,3,3a,4,7,7a-hexahydro-1H-indene-1-carboxylic acid methyl ester