2-pyridinecarboxylic acid, 2-[(3E)-1,2-dihydro-5-nitro-2-oxo-3H-indol-3-ylidene]hydrazide;2-Pyridinecarboxylic acid, 2-[(3Z)-1,2-dihydro-5-nitro-2-oxo-3H-indol-3-ylidene]hydrazide;N'-[(3E)-5-Nitro-2-oxo-1,2-dihydro-3H-indol-3-ylidene]pyridine-2-carbohydrazide
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