Patent ID: 7101983

Claim:
A dyestuff according to formula (I), wherein R 1 is —CH 3 ; —C 2 H 5 ; allyl; benzyl; propargyl; —C 2 H 4 CN; C 2 H 4 OCO—C 1-2 -alkyl; —C 1-3 -alkylene-COO—C 2 H 4 —N-phthalimid or —C 2 H 4 —COO—R 5 , R 2 is H, —CH 3 , —CH 2 CH 3 , —C 2 H 4 OCO—C 1-2 -alkyl or —C 2 H 4 —COO—R 5 , wherein R 5 is C 1-4 -alkyl; C 1-2 -alkoxyethyl; allyl; benzyl; propargyl; phenoxyethyl or tetrahydrofurfuryl-2.