2,7-Naphthalenedisulfonic acid, 4-amino-6-((5-chloro-2-hydroxyphenyl)azo)-5-hydroxy-, disodium salt 2,7-Naphthalenedisulfonic acid, 5-amino-3-((5-chloro-2-hydroxyphenyl)azo)-4-hydroxy-, disodium salt 6222-44-2