(4aS,8aS)-1,2-bis(hydroxymethyl)-5,5,8a-trimethyl-3,4,4a,5,6,7,8,8a-octahydronaphthalene

(5aS,9aS)-6,6,9a-trimethyl-3,5,5a,6,7,8,9,9a-octahydro-1H-spiro[naphtho[1,2-c]furan-4,2'-[1,3]dioxolan]-1-one

(5aS,9aS)-6,6,9a-trimethyl-3,5,5a,6,7,8,9,9a-octahydronaphtho[1,2-c]furan-1,4-dione