Patent ID: 7097702

Claim:
A dyestuff of formula (I) wherein R 1 is H; C 1-4 alkyl; substituted C 1-4 alkyl; phenyl or substituted phenyl, R 2 is H; C 1-4 alkyl; substituted C 1-4 alkyl; C 1-4 alkoxy; —COOH; —COOCH 3 ; —CF 3 ; —SO 3 H or —CN, R 3 is H; C 1-4 alkyl; substituted C 1-4 alkyl; C 1-4 alkoxy; —SO 3 H; —CN; acetylamino; —OH; —CF 3 or —SO 2 R 5 , wherein R 5 is unsubstituted C 1-4 alkyl or substituted C 1-4 alkyl, R 4 is H; unsubstituted C 1-4 alkyl or substituted C 1-4 alkyl, A is a radical of formula wherein B is C 1-4 alkylene, X is —SO 3 H or —SO 2 R 5 wherein R 5 has the same meanings as defined above, or A is a radical of formula —SO 2 R 6 , wherein R 6 is unsubstituted C 1-4 alkyl; substituted C 1-4 alkyl, m is 0 or 1.