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N-Methy noramidopyrine Noraminopyrine Methylaminophenazone Metamizole Impurity C Methylaminoantipyrine N-Methylaminophenazone 4-Methylaminophenazone Monomethylaminoantipyrine 4-(Methylamino)-antipyrine 4-Monomethylaminophenazone 4-Monomethylaminoantipyrine 4-(N-Methyl)-aminoantipyrine ANTIPYRINE, 4-(METHYLAMINO)- MetaMizole IMpurity C (4-MethylaMinoantipyrine) 1,5-dimethyl-4-methylamino-2-phenyl-3-pyrazolone 1,5-dimethyl-4-(methylamino)-2-phenylpyrazol-3-one 1,5-dimethyl-4-(methylamino)-2-phenyl-pyrazol-3-one 2,3-Dimethyl-4-methylamino-1-phenyl-3-pyrazolin-5-one Metamizole Sodium Impurity 3（Minocycline EP Impurity C） 3H-pyrazol-3-one, 1,2-dihydro-1,5-dimethyl-4-(methylamino) Metamizole Sodium Impurity 3（Metamizole Sodium EP Impurity C） 1,5-dimethyl-4-(methylamino)-2-phenyl-1,2-dihydropyrazol-3-one 1,2-dihydro-1,5-dimethyl-4-(methylamino)-2-phenyl-3H-pyrazol-3-one 2-(1-cyclohexa-2,4-dienyl)-1,5-dimethyl-4-(methylamino)-3-pyrazolone 3H-Pyrazol-3-one, 1,2-dihydro-1,5-dimethyl-4-(methylamino)-2-phenyl- 1,5-Dimethyl-4-(methylamino)-2-phenyl-1,2-dihydro-3H-pyrazol-3-one hydrochloride