disodium 3,3'-[sulphonylbis[p-phenyleneazo(5-imino-3-methyl-1H-pyrazole-4,1-diyl)]]bis(benzenesulphonate)

Benzenesulfonic acid, 3,3-sulfonylbis4,1-phenyleneazo(5-imino-3-methyl-1H-pyrazole-4,1-diyl)bis-, disodium salt

3,3'-[Sulfonylbis[4,1-phenyleneazo[(4,5-dihydro-5-imino-3-methyl-1H-pyrazole)-4,1-diyl]]]bis(benzenesulfonic acid sodium) salt