(3aS,4R,7aR)-4-hydroxy-3a,7a-dimethyloctahydro-2H-inden-2-one

(1S,3aR,7R,7aS)-7-((benzyloxy)methoxy)-3a,7a-dimethyl-2-oxooctahydro-1H-inden-1-yl acetate

(1S,3aR,7aR)-3a,7a-dimethyl-2,7-dioxooctahydro-1H-inden-1-yl acetate

methyl 2-((1R,2R)-2-formyl-1,2-dimethyl-3-oxocyclohexyl)acetate