2,7-Naphthalenedisulfonic acid, 5-ethoxy-4-hydroxy-3-((4-(6-methyl-2-benzothiazolyl)phenyl)azo)-, disodium salt 2846-11-9 5-Ethoxy-4-hydroxy-3-((4-(6-methyl-2-benzothiazolyl)phenyl)azo)-2,7-naphthalenedisulfonic acid, disodium salt