摘要 |
The present invention relates to compounds comprising the general formula (I), in which R<SUB>1</SUB>and R<SUB>2</SUB>, 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<SUB>3</SUB>, -CH(OR<SUB>3</SUB>)COOH, in which R<SUB>3</SUB> is selected from H, phenyl, benzyl , -CF<SUB>3</SUB> or -CF<SUB>2</SUB>CF<SUB>3</SUB>, vinyl, allyl and a linear or branched alkyl group having from 1 to 6 carbon atoms. |