A compound of the formula (I): ** Formula ** wherein A is ** Formula ** R1 is halogen, a linear or branched C1-C6 -C-alkyl group (each alkyl group may be independently substituted with one or more substituents selected from NRaRb, halogen and a hydroxy group), a linear or branched C1-C6 alkyl group (each alkyl group may be independently substituted with one or more substituents selected from halogen and a hydroxy group), a linear or branched C1-C6 -O-alkyl group (each alkyl group may be independently substituted with one or more substituents selected from halogen and a hydroxy group), or ** Formula ** in which R4 and R5 each independently represent hydrogen , a linear or branched C1-C6 alkyl group or a cycloalkyl group, or R4, R5 and the nitrogen atom to which they are attached are taken together to form a 3- to 8-membered aliphatic ring containing nitrogen (one or more atoms of carbon that with stituating the aliphatic ring containing nitrogen may be substituted with a nitrogen atom, a sulfur atom or an oxygen atom, and when a carbon atom is substituted with a nitrogen atom, the nitrogen atom may be substituted with a group linear or branched C1-C6 alkyl), or R4 and the nitrogen atom to which it is anchored are taken together with ring A to form a fused bicyclic ring containing 8 to 16 membered nitrogen (one or more carbon atoms constituting the fused bicyclic ring containing nitrogen may be substituted with a nitrogen atom, a sulfur atom or an oxygen atom, and when a carbon atom is substituted with a nitrogen atom, the nitrogen atom may be substituted with a group linear or branched C1-C6 alkyl) and R5 represents hydrogen, a linear or branched C1-C6 alkyl group or a cycloalkyl group, in which the line, which crosses the line ea of dots, means a link of the above general formula to the other structural radical, R2 or R3 each independently represent halogen, OH, COOH, SO3H, NO2, SH, NRaRb, a linear or branched C1-C6 alkyl group (each alkyl group may be independently
