4-?????-2-????? ethyl 3-acetoxy-2-butenoate 4,5-dihydro-a-(hydroxyMethyl)-a,3-diMethyl-5-oxo-1-phenyl-1H-Pyrazole-4-Methanesulfonic acid Phenylhydrazine BISPYRAZOLONE 4,5-Dihydro-α,3-diMethyl-5-oxo-1-phenyl-α-sulfo-1H-pyrazole-4-acetic Acid 3H-Pyrazol-3-one, 2,4-dihydro-4,4-bis(5-hydroxy-3-Methyl- 1-phenyl-1H-pyrazol-4-yl)-5-Methyl-2-phenyl- Edaravone 3,3'-diMethyl-1,1'-diphenyl-1H,1'H-4,4'-bipyrazole-5,5'-diol Ethyl (3E)-3-(2-phenylhydrazin-1-ylidene)butanoate 1H-Pyrazole,3-ethoxy-5-methyl-1-phenyl-(9CI) Edaravone Impurity 26 Edaravone iMpurity P3 Phenidone 5-Methyl-2-phenyl-1,2-dihydropyrazol-3-one 1H-Pyrazole, 5-methoxy-3-methyl-1-phenyl- Edaravone Impurity 8 Edaravone Impurity 5