Bis[2-[2-(1,3-dioxobutylamino)-6-methoxyphenylazo]-6-nitrobenzenesulfonic acid]barium salt C??? ??, ??, ??

Bis[2-[2-(1,3-dioxobutylamino)-6-methoxyphenylazo]-6-nitrobenzenesulfonic acid]barium salt ?? ?? ? ???

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Bis[2-[2-(1,3-dioxobutylamino)-6-methoxyphenylazo]-6-nitrobenzenesulfonic acid]barium salt ?? ??