(2E)-4-[2-(3-Nitrobenzoyl)hydrazino]-4-oxobut-2-enoic acid;(2E)-4-[2-(3-nitrobenzoyl)hydrazinyl]-4-oxobut-2-enoic acid;2-butenedioic acid, mono[2-(3-nitrobenzoyl)hydrazide], (2E)-
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