Chromate(2-), [2-[[4,5-dihydro-3-methyl-5-oxo-1-[4-[(1-oxo-2-propenyl)amino]phenyl]-1H-pyrazol-4-yl]azo]-5-nitrobenzoato(2-)][2-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]-4-sulfobenzoato(3-)]-, disodium