Patent ID: 7125871

Claim:
A compound of the formula: in which: R represents CN or a group of formula CONR 1 (X 1 R 2 ); X 1 represents a bond, NHCO, NH, O or (CH 2 ) p —Y— in which Y represents O, S, NR b , or COO and p is 2 or 3, and R 1 , R 2 and R b each independently represents hydrogen; C 1-10 alkyl; C 2-10 alkenyl; C 2-10 alkynyl; aryl; aryl-C 1-10 alkyl; aryl -C 2-10 alkenyl; aryl-C 2-10 alkynyl; heteroaryl; C 3-8 cycloalkyl; C 3-8 -cycloalkyl-C 1-10 alkyl; a group of formula CH(R 3 )COOH in which R 3 represents an amino acid residue; or R 1 and X 1 R 2 together with the nitrogen atom to which they are attached form a 5 to 6-membered saturated heterocyclic ring, which ring may optionally be fused with an aromatic ring; an ester thereof; or a salt of said compound of formula I or said ester thereof.