2,7-Naphthalenedisulfonic acid, 3-[(4-formylphenyl)azo]-4,5-dihydroxy-, disodium salt 5850-58-8 C.I. 16605 C.I. Acid Red 19 C.I. Acid Red 19, disodium salt Chromazone Red A Levamin Red GG NSC148367