1-Phthalazinecarboxylic acid, 3,4-dihydro-4-oxo-, hydrazide;1-phthalazinecarboxylic acid, 4-hydroxy-, hydrazide;4-Oxo-3,4-dihydrophthalazine-1-carbohydrazide;4-Oxo-3,4-dihydro-phthalazine-1-carboxylic acid hydrazide
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