trisodium 2-[[4,5-dihydro-3-methyl-5-oxo-1-[4-[[2-(sulphonatooxy)ethyl]sulphonyl]phenyl]-1H-pyrazol-4-yl]azo]naphthalene-1,5-disulphonate

1,5-Naphthalenedisulfonic acid, 2-[[4,5-dihydro-3-methyl-5-oxo-1-[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]-1H-pyrazol-4-yl]azo]-, trisodium salt

2-[[[4,5-Dihydro-3-methyl-5-oxo-1-[4-[[2-[[(sodiooxy)sulfonyl]oxy]ethyl]sulfonyl]phenyl]-1H-pyrazol]-4-yl]azo]-1,5-naphthalenedisulfonic acid disodium salt