Patent ID: 7629459

Claim:
A compound represented by formula (III): Formula (III) wherein V 1 and V 2 each represent a substituent, and at least one of V 1 and V 2 represents a hydroxyl group; a dimethylamino group, a methanesulfonamido group, a 4-butanesulfonamido group, a p-toluenesulfonamido group, or a pentafluorobenzenesulfonamido group; and a remaining substituent of V 1 or V 2 is selected from W1 or W2, wherein W1 represents an amino (NH 2 ) group; an alkyl- or aryl-amino group having 1 to 60 carbon atoms; a dialkyl- or diaryl-amino group having 2 to 60 carbon atoms; an N-alkvl-N-arylamino group having 6 to 60 carbon atoms; an acylamino group having 2 to 10 carbon atoms; or a sulfonamido group having 1 to 60 carbon atoms; W2 represents a nitro group; a cyano group; an alkenyl group having 2 to 10 carbon atoms; an aryl group having 6 to 20 carbon atoms; an acyl group having 1 to 20 carbon atoms; a sulfonyl group having 1 to 20 carbon atoms; an alkyl-sulfinyl group having 1 to 20 carbon atoms; an aryl-sulfinyl group having 1 to 20 carbon atoms; a carbamoyl group having 1 to 10 carbon atoms; a sulfamoyl group having 0 to 10 carbon atoms; a sulfo group; a carboxyl group; an aryloxycarbonyl group having 6 to 20 carbon atoms; or a heterocyclic group having 0 to 20 carbon atoms; r represents 1 to 4; M 1 represents a counter ion; and m 1 represents the number necessary for neutralizing charge; wherein when V 1 and V 2 are uncharged, m 1 is zero.