| abstract |
Compounds, characterized in that they have the following general formula (I): ** see formula ** in which: - R 1, R 2, R 3 and R 4, identical or different, represent a hydrogen atom, a hydroxyl group, a linear or branched C 1 -C 6 alkyl group, a linear or branched C 1-C 6 alkoxy group, a linear or branched C 1 -C 6 alkyl group. - R5 represents a hydrogen atom or a linear or branched (C1-C6) alkyl group, - m is an integer between 0 and 2, and - n is an integer between 8 and 25. |