title: The isolation and identification of quininone from Cinchona ledgeriana.
mesh_terms: D002929:Cinchona / Q000032:analysis*; D003460:Crystallization; D007259:Infrared Rays; D009682:Magnetic Resonance Spectroscopy; D010946:Plants, Medicinal; D011809:Quinones / Q000302:isolation & purification*; D013057:Spectrum Analysis; D014466:Ultraviolet Rays
chemical_list: D011809:Quinones