1914-99-4 2,7-Naphthalenedisulfonic acid, 3,6-bis (4-chloro-2-phosphonophenyl)azo -4,5-di 2,7-Naphthalenedisulfonic acid, 3,6-bis((4-chloro-2-phosphonophenyl)azo)-4,5-dihydroxy- 3,6-Bis((4-chloro-2-phosphonophenyl)azo)-4,5-dihydroxynaphthalene-2,7-disulphonic acid Dichlorophosphonoazo III EINECS 217-628-8