(3S-(3α,4β,4aβ,8aβ)) 4-ethenyl-3,4,4a,5,6,7,8,8a-octahydro-3,4a,8,8-tetramethylnaphthalen-2(1H)-one

[(4aS,8aS)-3,4,4a,5,6,7,8,8a-octahydro-2,5,5,8a-tetramethylnaphthalen-1-yl]acetaldehyde