2-Naphthalenesulfonic acid, 3-((3,5-dichloro-2-hydroxyphenyl)azo)-4-hydroxy-7-((4-methoxyphenyl)amino)-, monosodium salt 2-Naphthalenesulfonic acid, 3-((3,5-dichloro-2-hydroxyphenyl)azo)-4-hydroxy-7-((4-methoxyphenyl)amino)-, sodium salt 68413-54-7