title: Tobacco chemistry. 20. Structures and syntheses of three new tobacco constituents of probable isoprenoid origin.
mesh_terms: D006115:Greece; D007659:Ketones / Q000138:chemical synthesis / Q000302:isolation & purification; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D008722:Methods; D010947:Plants, Toxic; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D013729:Terpenes / Q000138:chemical synthesis / Q000302:isolation & purification*; D014026:Nicotiana / Q000032:analysis*
chemical_list: D007659:Ketones; D013729:Terpenes