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Benzenesulfonic acid, 4,4'-[methylenebis[4,1-phenyleneazo( 4,5-dihydro-3-methyl-5-oxo-1H-pyrazole -4,1-diyl)]]bis[3-methyl-, disodium salt Structure

Benzenesulfonic acid, 4,4'-[methylenebis[4,1-phenyleneazo( 4,5-dihydro-3-methyl-5-oxo-1H-pyrazole -4,1-diyl)]]bis[3-methyl-, disodium salt