1-Naphthalenesulfonic acid, 4,4'-(carbonylbis(imino-4,1-phenylene(4,5-dihydro-3-methyl-5-oxo-1H-pyrazole-1,4-diyl)azo))bis(3-hydroxy-7-nitro-, disodium salt 6410-47-5 Disodium 4,4'-(carbonylbis(imino-4,1-phenylene(4,5-dihydro-3-methyl-5-oxo-1H-pyrazole-1,4-diyl)azo))bis(3-hydroxy-7-nitronaphthalene-1-sulphonate) EINECS 229-109-3