66967-97-3 AMMONIUM, (3-HYDROXY-4-(p-SULFOPHENYLAZO)PHENYL)TRIMETHYL-, SODIUM SALT, BENZENE Ammonium, (3-hydroxy-4-(p-sulfophenylazo)phenyl)trimethyl-, sodium salt, benzenesulfonate, dimethylcarbamate (ester) Ro 2-1941