140189-94-2

1,4-Benzenedisulfonic acid,2-[4-[3-[1-(2,5-disulfophenyl)-2,3-dihydro-5-hydroxy-3-oxo-1H-pyrazol-4-yl]-2-propenylidene]-3,5-dioxo-1-pyrazolidinyl]-, pentasodium salt