2-[1-(ethoxycarbonyl)-2-hydroxy-1-propenyl]benzo[b]furan

ethyl (3aS,8bS)-2-methyl-3a,8b-dihydrofuro[3,2-b]benzofuran-3-carboxylate

ethyl (3aR,8aR)-2-methyl-3a,8a-dihydrofuro[2,3-b]benzofuran-3-carboxylate

ethyl 2-(3-nitroanilino)-2-oxoacetate