title: Studies on orchidaceae alkaloids. XXII. Synthesis and absolute configuration of pierardine. Lactone-betaine isomerization of shihunine.
mesh_terms: D000470:Alkaloids / Q000032:analysis*; D001622:Betaine; D002942:Circular Dichroism; D007783:Lactones; D009682:Magnetic Resonance Spectroscopy; D010944:Plants / Q000032:analysis
chemical_list: D000470:Alkaloids; D007783:Lactones; D001622:Betaine