disodium 1-hydroxy-2-[[4-(6-methyl-2-benzothiazol-1-yl)phenyl]azo]naphthalenedisulphonate

4-Hydroxy-3-[[4-(6-methyl-2-bezothiazolyl)phenyl]azo]-2,？-naphthalensulfonic acid disodium salt

2,?-Naphthalenedisulfonic acid, 4-hydroxy-3-4-(6-methyl-2-benzothiazolyl)phenylazo-, disodium salt