Similar names: Acetamide, N-antipyrinyl- (8CI); Antipyrine, 4-acetamido- (6CI,7CI); N-(2,3-Dihydro-1,5-dimethyl-3-oxo-2-phenyl-1H-pyrazol-4-yl)acetamide; 4-(N-Acetylamino)antipyrine; 4-Acetamido-2,3-dimethyl-1-phenylpyrazol-5-one; 4-Acetamidoantipyrine; 4-Acetaminoantipyrine; 4-Acetoaminoantipyrine; 4-Acetylaminoantipyrine; 4-Acetylaminophenazone; Acetylaminoantipyrine; N-Acetyl-4-aminoantipyrine; N-Acetyl-4-aminophenazone; N-Antipyrinylacetamide; NSC 331807