2-Naphthalenesulfonic acid, 7-((2-hydroxy-5-((4-hydroxyphenyl)sulfonyl)phenyl)methyl)- 66214-40-2 7-((2-Hydroxy-5-((4-hydroxyphenyl)sulphonyl)phenyl)methyl)naphthalene-2-sulphonic acid EINECS 266-241-0