1-Phenyl-2,3-dimethyl-4-butyrylamino-5-pyrazolone 4417-84-9 5-25-14-00100 (Beilstein Handbook Reference) BRN 0620886 BUTYRAMIDE, N-ANTIPYRINYL- Butanamide, N-(2,3-dihydro-1,5-dimethyl-3-oxo-2-phenyl-1H-pyrazol-4-yl)- N-Antipyrinylbutyramide