Patent ID: 7825268

Claim:
A compound of the formula I, wherein A 1 is O or NH; A 2 is O or S; each of R 1 and R 2 is independently hydrogen, a methyl or C 2 -C 8 -saturated or mono- or doubly unsaturated, branched or linear hydrocarbon group or a C 2 -C 8 -saturated or mono- or doubly unsaturated, branched or linear hydrocarbon group comprised of an O and/or S atom in the chain wherein the hydrocarbon group is optionally mono- or multiply-substituted by a substituent selected from the group consisting of halogen, hydroxy, C 1 -C 6 -alkyl, trifluoromethyl, C 1 -C 6 -alkoxy, C 6 -C 10 -aryl, and C 1 -C 6 -alkyl-C 6 -C 10 -aryl; R 3 is a C 1 -C 18 -saturated or mono or doubly unsaturated, branched or linear hydrocarbon group or a C 1 -C 18 -saturated or mono- or doubly unsaturated, branched or linear hydrocarbon group comprised of an O and/or S atom in the chain wherein the hydrocarbon group is optionally mono- or multiply-substituted by a substituent selected from the group consisting of halogen, hydroxy, C 1 -C 6 -alkyl, trifluoromethyl, C 1 -C 6 -alkoxy, C 6 -C 10 -aryl, and C 1 -C 6 -alkyl-C 6 -C 10 -aryl; with the proviso that when each of A 1 and A 2 is O and each of R 1 and R 2 is hydrogen or methyl, R 3 is other than methylene or ethylene.