Patent ID: 7659266

Claim:
A compound of formula (i) or its salt in which: R 1 , R 2 , R 4 , R 5 and R 6 represent, independently, a hydrogen atom, halogen atom, the OH group, an alkyl, alkoxy, cyano, nitro, amino, alkylamino radical or carboxylic acid; R 3 represents a hydrogen atom, an alkyl radical or a —COR 10 group; R 10 represents a hydrogen atom or an alkyl, alkoxy, aryl radical, or a heterocyclic radical; W represents sulfur atom; R 7 represents a hydrogen atom or an alkyl radical; R 8 represents a hydrogen atom, a haloalkyl or alkenyl radical, a cycloalkyl radical, a linear or branched alkyl radical, optionally substituted with carboxylic acid, amino, alcohol, guanidine, amidine, thiol, thioether, thioester, alkoxy, heterocyclic or carboxamide; R 9 represents a hydrogen atom, an alkyl, aryl, arylalkyl, bisarylalkyl radical, a heterocyclic radical, a heterocyclic alkyl radical or a —COR 10 group; with the proviso that: