Patent ID: 8153841

Claim:
A compound of the general formula (I) in which R 1 and R 2 , which may be identical or different, are selected from the group consisting of —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 is selected from the group consisting of —H, —OH, —COOH, —OR 3 , —CH(OR 3 )COOH, in which R 3 is selected from 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; Z is selected from the group consisting of, —CH(OR 3 )COOH, in which R 3 is selected from 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; wherein —NR 1 R 2 is bonded at the 4-position; and salts thereof.