2-Naphthalenesulfonic acid, 7-((4-aminobenzoyl)amino)-4-hydroxy-3-((2-methoxyphenyl)azo)-, monosodium salt 6470-23-1 EINECS 229-295-6 Sodium 7-((4-aminobenzoyl)amino)-4-hydroxy-3-((2-methoxyphenyl)azo)naphthalene-2-sulphonate