2,7-Naphthalenedisulfonic acid, 3,6-bis((5-chloro-2-hydroxy-3-sulfophenyl)azo)-4,5-dihydroxy- 2103-73-3 3,6-Bis((5-chloro-2-hydroxy-3-sulphophenyl)azo)-4,5-dihydroxynaphthalene-2,7-disulphonic acid Chlorosulfophenol S EINECS 218-273-1