Patent ID: 8445727

Claim:
A compound of formula (I): wherein the dotted line represents a carbon-carbon single bond or a carbon-carbon double bond; one R 1 is a hydrogen atom and the other R 1 represents a hydrogen atom or a methyl or ethyl group; X represents a C═CH 2 or C═CHCH 3 group or a CHR 2 or CHR 2 CHR 2 group; each R 2 , independently from each other, represents a hydrogen atom or a methyl or ethyl group; and R 3 represents a a group of formula CR 4 ═C(R 4 ) 2 , or a group of formula (II) wherein R 4 represents, independently from each other, a hydrogen atom or a methyl or ethyl group; and wherein the compound is in the form of a pure enantiomer or a mixture thereof.