CAS No.: 60-80-0 Synonyms: Phenazonum; 2,3-Dimethyl-1-phenyl-3-pyrazolin-5-one; Phenazone Formula: C₁₁H₁₂N₂O Formula Weight: 188.23 Linear Formula: C₁₁H₁₂N₂O MDL No.: MFCD00003146 Melting Point: 109-111 °C(lit.)