(4aS,8aS)-1-[1-Methoxy-meth-(Z)-ylidene]-5,5,8a-trimethyl-1,4,4a,5,6,7,8,8a-octahydro-naphthalene-2-carbaldehyde

(1aS,3aR,7aR,7bR)-4,4,7a-Trimethyl-octahydro-1-oxa-cyclopropa[a]naphthalene-1a-carbaldehyde

(1S,4aS,8aS)-2-[1,3]Dioxan-2-yl-1-hydroxy-5,5,8a-trimethyl-1,4,4a,5,6,7,8,8a-octahydro-naphthalene-1-carbaldehyde

(1S,4aS,8aS)-5,5,8a-trimethyl-2'-oxo-4a,5,6,7,8,8a-hexahydro-4H-spiro[naphthalene-1,4'-[1,3]dioxolane]-2-carbaldehyde