| abstract |
The present invention relates to compounds comprising the general formula (I), in which R 1 and R 2 , which may be identical or different, are selected from the group comprising —H or a linear or branched alkyl group having from 1 to 6 carbon atoms or together form an aromatic or aliphatic ring with 5 or 6 atoms; Y and Z, which may be identical or different, are selected from the group comprising —H, —OH, —COOH, —OR 3 , —CH(OR 3 )COOH, in which R 3 is selected from H, phenyl, benzyl, —CF 3 or —CF 2 CF 3 , vinyl, allyl and a linear or branched alkyl group having from 1 to 6 carbon atoms. |