(1β,6β)-Bicyclo[4.3.0]nonane-3-ene-8-one

(1α,6α)-Bicyclo[4.3.0]nonane-3-ene-8-one

1,3,3aβ,4,7,7aα-Hexahydro-2H-inden-2-one

(3aS,7aR)-3a,4,7,7a-Tetrahydroindan-2-one

(3aα,7aα)-3a,4,7,7a-Tetrahydro-1H-indene-2(3H)-one