2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-, monosodium salt 4-Amino-5-hydroxy-2,7-naphthalenedisulfonic acid, monosodium 5460-09-3 8-Amino-1-naphthol-3,6-disulfonic acid monosodium salt Ash acid H acid monosodium salt NSC8632