trisodium 4-amino-3-[[4-[[4-[[2-[[2-(diethylamino)ethyl]amino]-4-hydroxyphenyl]azo]phenyl]amino]-3-sulphonatophenyl]azo]-5-hydroxy-6-(phenylazo)naphthalene-2,7-disulphonate

4-Amino-3-[4-[4-[2-[2-(diethylamino)ethylamino]-4-hydroxyphenylazo]phenylamino]-3-(sodiosulfo)phenylazo]-5-hydroxy-6-(phenylazo)-2,7-naphthalenedisulfonic acid disodium salt