1,2,3,4,4A,5,6,7-八氢萘

3-甲氧基苯并[c]色烯-6-酮

4,4a,5,6,7,8-六氢-3H-萘-2-酮

4-(2-oxocyclohexyl)butanoic acid

ethyl 2-oxo-1-(2-oxopropyl)cyclohexane-1-carboxylate