1,3-Naphthalenedisulfonic acid, 7-hydroxy-8-((4'-((4-hydroxyphenyl)azo)(1,1'-biphenyl)-4-yl)azo)- 117-33-9 7-Hydroxy-8-((4'-((4-hydroxyphenyl)azo)(1,1'-biphenyl)-4-yl)azo)naphthalene-1,3-disulphonic acid EINECS 204-184-5