Patent ID: 7846890

Claim:
A compound of formula wherein R 1 or R 2 , taken separately, represents each a C 1-3 alkyl group or a COR 3 group, R 3 representing a methyl or ethyl group, and one of said R 1 or R 2 , but not both, may also represent a hydrogen atom; or said R 1 and R 2 , taken together, represent a C(R 4 ) 2 group, each R 4 representing a hydrogen atom, a C 1-3 alkyl group or, taken together, a CH 2 —(CH 2 ) 2 —CH 2 or CH 2 —(CH 2 ) 3 —CH 2 group; in the form of any one of its isomers or of a mixture thereof, provided that the 3-acetate of [1aR-(1aα,2β,3β,4aβ,8aS)]-decahydro-2,4a,8,8-tetramethyl-cyclopropa[d]naphthalene-2,3-diol and the 2-acetate of (1aR,2S,3S,4aS,8aS)-decahydro-2,4a,8,8-tetramethyl-cyclopropa[d]naphthalene-2,3-diol are excluded.