Patent ID: 7078570

Claim:
A compound of the formula (I) comprising less than 18 carbon atoms wherein A is a residue of the formula II, III or IV wherein R 1 -R 6 are independently hydrogen or a methyl group, R 7 is a methyl or ethyl group, and R 8 and R 7 are capable of forming together a furan ring; X is either a carbonyl group or CR 8 OR 9 , wherein R 8 is hydrogen, methyl, ethyl, propyl, ethynyl or vinyl and R 9 is hydrogen, methyl or ethyl; R 10 is hydrogen, methyl or ethyl; the dotted line in formula (II) is a bond only if X is OR 8 R 9 ; and the dotted line in formula (III) and the dotted line in formula (IV) optionally is a bond.