Patent ID: 8709129

Claim:
A compound which fits the general formula (I) hereafter: wherein: R 1 and R 2 , either identical or different, represent (a) a hydrogen atom, (b) a linear or branched non-cyclic saturated or unsaturated C 1 -C 12 hydrocarbon group, (c) a phenyl group, a benzyl group, a biphenyl group or a tolyl group; R 3 represents (a) a hydrogen atom, (b) a linear or branched non-cyclic saturated or unsaturated C 1 -C 12 hydrocarbon group, (c) a phenyl group, a tolyl group or a linear or branched C 1 -C 12 alkoxy group; and R 4 represents (a) a hydrogen atom, (b) a linear or branched non-cyclic saturated or unsaturated C 1 -C 12 hydrocarbon group, (c) a phenyl group or a tolyl group.