2-Naphthalenesulfonic acid, 3-((5-hydroxy-2-((4-hydroxyphenyl)sulfonyl)phenyl)methyl)-, monosodium salt 68959-14-8 EINECS 273-398-9 Sodium 3-((5-hydroxy-2-((4-hydroxyphenyl)sulphonyl)phenyl)methyl)naphthalene-2-sulphonate