129-96-4 148-25-4 2,7-Naphthalenedisulfonic acid, 4,5-dihydroxy- 3888-44-6 4,5-Dihydroxy-2,7-naphthalenedisulfonic acid 4,5-Dihydroxynaphthalene-2,7-disulphonic acid AI3-18239 Chromotropic acid EINECS 205-712-7 NSC 37043