EINECS 219-721-9, 4-Amino-5-oxo-1-(p-sulphophenyl)-2-pyrazoline-3-carboxylic acid, SCAOP, 4-amino-5-oxo-1-(4-sulfophenyl)-4,5-dihydro-1H-pyrazole-3-carboxylic acid, 4-Amino-5-oxo-1-<4-sulfo-phenyl>-2-pyrazolin-3-carbonsaeure, 4-amino-5-oxo-1-(4-sulfo-phenyl)-2,5-dihydro-1H-pyrazole-3-carboxylic acid, 4-amino-5-oxo-1-(4-sulfophenyl)-4H-pyrazole-3-carboxylic acid, 4-amino-5-oxo-1-(p-sulfophenyl)-2-pyrazoline-3-carboxylic acid