title: Quantum mechanical study on the conformational properties of antihistaminic drugs.
mesh_terms: D004155:Diphenhydramine; D004355:Drug Stability; D006632:Histamine; D006634:Histamine H1 Antagonists; D008968:Molecular Conformation; D010632:Pheniramine; D011789:Quantum Theory; D014867:Water; D014961:X-Ray Diffraction
chemical_list: D006634:Histamine H1 Antagonists; D014867:Water; D010632:Pheniramine; D006632:Histamine; D004155:Diphenhydramine