3-methyl-1-phenyl-1H-pyrazol-5(4H)-one; Demethylated antipyrine;N-Demethylantipyrine;5-methyl-2-phenyl-1H-pyrazol-3(2H)-one;5-Methyl-2-phenyl-2H-pyrazol-3-ol;5-hydroxy-3-methyl-1-phenylpyrazole;3H-Pyrazol-3-one, 1,2-dihydro-5-methyl-2-phenyl-;1H-Pyrazol-5-ol, 3-methyl-1-phenyl-;1,2-Dihydro-5-methyl-2-phenyl-3H-pyrazol-3-one
