Patent ID: 7771691

Claim:
A compound of formula I wherein O—X—NH— is a C 2 to C 5 alkyl, aryl or benzyl; R 1 is selected from the group comprising linear or branched alkyl and polyethers, optionally unsaturated; R 2 and R 3 are selected independently from the group comprising H, hydroxyl, protected alcohol functionalities, ether, acyl, carboxylate, alkoxycarbonyl; linear or branched alkyl optionally unsaturated and optionally substituted by one or more of the following: carbocycles, heterocarbocycles, aromatic rings, heteroaromatic rings, hydroxyl, protected alcohol functionalities, ether, acyl, carboxylate and akoxycarbonyl; cycloalkyl, heterocycloalkyl, aryl, heteroaryl, benzyl which are optionally substituted by one or more of the following: alkyl, hydroxyl, protected alcohol functionalities, ether, acyl, carboxylate and alkoxycarbonyl; or wherein R 2 and R 3 together form a carbocyclic or heterocyclic group having from 5 to 8 members, optionally fused to other cyclic systems and optionally substituted by one or more of the following: alkyl, hydroxyl, protected alcohol functionalities, ether, acyl, carboxylate and alkoxycarbonyl.