2,7-Naphthalenedisulfonic acid, 4-amino-3-((4'-((2,4-diaminophenyl)azo)-2,2'-disulfo(1,1'-biphenyl)-4-yl)azo)-5-hydroxy-6-(phenylazo)- 4-Amino-3-((4'-((2,4-diaminophenyl)azo)-2,2'-disulfo(1,1'-biphenyl)-4-yl)azo)-5-hydroxy-6-(phenylazo)-2,7-naphthalenedisulfonic acid 41601-42-7