2-Methoxyanilin-5-sulfonsure-4′-nitrophenylester

p-nitrophenyl 3-amino-4-methoxybenzenesulphonate

o-Anisidine-5-sulfonic acid 4-nitrophenyl ester (NH2=1)

3-Amino-4-methoxybenzenesulfonic acid 4-nitrophenyl ester