(R)-5',8'a-Dimethyl-1',3',4',7',8',8'a-hexahydrospiro[[1,3]-dioxolane-2,2'-naphthalen]-6'-one

(-)-[4aR,8aS]-1,1',8a-trimethyloctahydro-6,6'-(1,3-dioxolane)-naphthalene

(-)-[4aR,8aS]-1,1',8a-trimethylhexahydro-6,6'-(1,3-dioxolane)-2(3H)-naphthalenone

(R)-5',8'a-Dimethyl-3',4',4'a,7',8',8'a-hexahydro-1'H-spiro[[1,3]dioxolane-2,2'-naphthalene]