edaravone1-phenyl-3-methyl-5-oxo-2-pyrazoline2,4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-one3-methyl-1-phenyl-2-pyrazolin-5-one3-methyl-1-phenyl-5-pyrazolone3-methyl-1-phenylpyrazol-5-oneC.I. developer 1Edaravonedeveloper Zmethylphenylpyrazolonenorphenazonephenyl methyl pyrazolonephenylmethylpyrazolone