Patent ID: 7250120

Claim:
A compound having the following formula (I) wherein: (1) R 1 represents a group wherein R 4 and R 5 represent linear or branched alkyl group having 1 to 12 carbon atoms, a benzyl, naplithyl or phenyl group optionally substituted by at least one linear or branched alkyl group having 1 to 6 carbon atoms; (2) R 2 and R 3 are defined as follows: (A) R 2 represents one of the following groups: (A1) a hydrogen; (A2) a linear or branched alkyl group having 1 to 12 carbon atoms, advantageously 1 to 6 carbon atoms; (A3) a cycloalkyl group having 3 to 12 carbon atoms; (A4) a phenyl or benzyl group, optionally substituted; (A5) a linear or branched alkoxy group having 1 to 12 carbon atoms, advantageously 1 to 6 carbon atoms; and (A6) a group wherein R 4 and R 5 have the same meaning as defined supra for R 1; (B) R 3 represents one of the following groups: (B1) a hydrogen; (B2) a linear or branched alkyl group having 1 to 12 carbon atoms, advantageously 1 to 6 carbon atoms; (B3) a cycloalkyl group having 3 to 12 carbon atoms; (B4) a phenyl or benzyl group, optionally substituted; and (B5) a linear or branched alkoxy group having 1 to 12 carbon atoms, advantageously 1 to 6 carbon atoms; or (C) the R 2 and R 3 , groups, taken together, form an aromatic or non-aromatic cyclic group having one ring or two annelated rings which can comprise at least one heteroatom selected from the group consisting of: oxygen, sulfur and nitrogen; the aromatic or non-aromatic rings being independently 5 to 7-membered; and (3) the group is a benzo, naphtho or phenanthro group optionally substituted or annelated with other aromatic or non-aromatic rings.