title: Synthesis of novel analgesic agents. II. Pyrazolidines with nonoxygenated phenyl substituents.
mesh_terms: D000700:Analgesics / Q000138:chemical synthesis*; D007259:Infrared Rays; D009682:Magnetic Resonance Spectroscopy; D008745:Methylation; D011720:Pyrazoles / Q000138:chemical synthesis*; D013057:Spectrum Analysis; D013329:Structure-Activity Relationship
chemical_list: D000700:Analgesics; D011720:Pyrazoles