1-AMINO-8-NAPHTHOL-2,4-DISULFONIC ACID MONOSODIUM SALT, Chicago Acid Hydrate, SS Acid Hydrate, Sodium Hydrogen 4-Amino-5-hydroxy-1,3-naphthalenedisulfonate Hydrate, Monosodium 1-Amino-8-naphthol-2,4-disulfonate Hydrate, 4-Amino-5-hydroxy-1,3-naphthalenedisulfonic Acid Monosodium Salt Hydrate, 2S Acid Hydrate