Synonyms: (4E)-5-Imino-4-[(4-methylphenyl)hydrazono]-4,5-dihydro-1H-pyrazol-3-amine;(4Z)-5-Imino-4-[(4-methylphenyl)hydrazono]-4,5-dihydro-1H-pyrazol-3-amine;3,5-diiminopyrazolidin-4-one (4-methylphenyl)hydrazone;4H-pyrazol-4-one, 3-amino-1,5-dihydro-5-imino-, 2-(4-methylphenyl)hydrazone, (4E)-;4H-Pyrazol-4-one, 3-amino-1,5-dihydro-5-imino-, 2-(4-methylphenyl)hydrazone, (4Z)-