1,5-naphthalenedisulfonic acid, pyrazolylazo derivative

trisodium 3-[[4,5-dihydro-3-methyl-5-oxo-1-(4-sulphonatophenyl)-1H-pyrazol-4-yl]azo]naphthalene-1,5-disulphonate

1,5-Naphthalenedisulfonic acid, 3-[[4,5-dihydro-3-methyl- 5-oxo-1-(4-sulfophenyl)-1H-pyrazol-4-yl]azo]-, trisodium salt

3-[[[4,5-Dihydro-3-methyl-5-oxo-1-[4-(sodiooxysulfonyl)phenyl]-1H-pyrazol]-4-yl]azo]-1,5-naphthalenedisulfonic acid disodium salt