2',4',8-Trihydroxy-3,6-disulfo-5'-(2-hydroxy-3,5-dinitrophenylazo)-3'-(4-nitrophenylazo)-1-naphthaleneazobenzene 2,7-Naphthalenedisulfonic acid, 4-((2,4-dihydroxy-5-((2-hydroxy-3,5-dinitrophenyl)azo)-3-((4-nitrophenyl)azo)phenyl)azo)-5-hydroxy- 71799-74-1