trisodium 2-[(4-chloro-6-methoxy-1,3,5-triazin-2-yl)amino]-5-[[4,5-dihydro-3-methyl-5-oxo-1-(4-sulphonatophenyl)-1H-pyrazol-4-yl]azo]benzene-1,4-disulphonate

2-[(4-Chloro-6-methoxy-1,3,5-triazin-2-yl)amino]-5-[[[4,5-dihydro-3-methyl-5-oxo-1-[4-(sodiooxysulfonyl)phenyl]-1H-pyrazol]-4-yl]azo]-1,4-benzenedisulfonic acid disodium salt