Patent ID: 7635781

Claim:
A compound of formula (X) wherein R 1 , R 2 , equal to or different from each other are hydrogen or a linear or branched saturated or unsaturated C 1 -C 20 -alkyl, C 3 -C 20 -cycloalkyl, C 6 -C 20 aryl, C 7 -C 20 -alkylaryl or C 7 -C 20 -arylalkyl radical ; and R 3 is hydrogen or a linear or branched saturated or unsaturated C 1 -C 20 -alkyl, C 3 -C 20 -cycloalkyl, C 6 -C 20 -aryl, C 7 -C 20 -alkylaryl or C 7 -C 20 -arylalkyl radical, wherein at least one of R 1 , R 2 or R 3 is different from hydrogen.