Patent ID: RE43006

Claim:
A compound of Formula I wherein A is selected from benzene and naphthalene rings; R 1 is a saturated, unsaturated, straight, branched, alicyclic or an aromatic C 10 -C 30 hydrocarbon residue which can contain heteroatoms and can be substituted by an ionic substituent; R 2 in 2- or 3-position is a hydrogen, a straight or branched C 1 -C 6 residue, an optionally substituted aromatic or an optionally substituted heterocyclic residue; R 3 and R 4 are a hydrogen, a straight or branched C 1 -C 6 alkyl, a C 1 -C 6 alkoxy residue, a substituted or condensed heterocyclic residue, â€”OH, â€”NO 2 , â€”NH 2 , â€”N(C 1 -C 6 alkyl) 2 , â€”N(hydroxyalkyl) 2 , â€”NHCO 2 CH 3 or â€”NH(heterocycle), wherein R 2 , R 3 and R 4 are the same or different; X is an â€”OH or NHR 6 , wherein R 6 is a hydrogen, a saturated or unsaturated, straight or branched C 1 -C 20 hydrocarbon, or an optionally substituted aromatic or heterocyclic residue; and the acrylic double bond is of the E configuration.