ethyl 7-oxo-1,2,3,4,5,6-hexahydronaphthalene-4a-carboxylate

4a-methyl-3,4,9,10-tetrahydrophenanthren-2-one

2-methyl-2-(3-oxobutyl)cyclohexane-1,3-dione

3-(2,5-dimethyl-6-oxocyclohexen-1-yl)propanoic acid