5-((((4-((3-Carboxy-4-hydroxyphenyl)azo)phenyl)thio)phenyl)azo)salicylic acid 68391-17-3 Benzoic acid, 5-((((4-((3-carboxy-4-hydroxyphenyl)azo)phenyl)thio)phenyl)azo)-2-hydroxy- EINECS 269-932-5