Ammonia chemical ionization tandem mass spectrometry in structure determination of alkaloids. I. Pyrrolidines, piperidines, decahydroquinolines, pyrrolizidines, indolizidines, quinolizidines and an azabicyclo[5.3.0]decane

Ammonia chemical ionization tandem mass spectrometry in structure determination of alkaloids. I. Pyrrolidines, piperidines, decahydroquinolines, pyrrolizidines, indolizidines, quinolizidines and an azabicyclo[5.3.0]decane Ammonia chemical ionization tandem mass spectrometry in structure determination of alkaloids. I. Pyrrolidines, piperidines, decahydroquinolines, pyrrolizidines, indolizidines, quinolizidines and an azabicyclo[5.3.0]decane Analysis of Plant Alkaloid Mixtures by Ammonia Chemical Ionization Mass Spectrometry Anwendungen der Massenspektrometrie zur Strukturaufkl�rung von Alkaloiden, 7. Mitt.: Neue Alkaloide aus Gonioma Kamassi E. Mey Capillary Gas Chromatography/Positive and Negative Ion Chemical Ionization Mass Spectrometry on Pyrrolizidine Alkaloids of Senecio inaequidens Using Ammonia and Hydroxyl Ions as the Reagent Species Capillary Gas Chromatography/Positive and Negative Ion Chemical Ionization Mass Spectrometry on Pyrrolizidine Alkaloids of Senecio inaequidens Using Ammonia and Hydroxyl Ions as the Reagent Species Quindolinocryptotackieine: the elucidation of a novel indoloquinoline alkaloid structure through the use of computer‐assisted structure elucidation and 2D NMR Quindolinocryptotackieine: the elucidation of a novel indoloquinoline alkaloid structure through the use of computer‐assisted structure elucidation and 2D NMR Ammonium positive-ion and hydroxide negative-ion chemical ionization gas chromatography—mass spectrometry for the identification of pyrrolizidine alkaloids in Eupatorium rotundifolium L. var. ovatum Structure of Alkaloid 275A, a Novel 1-Azabicyclo[5.3.0]decane from a Dendrobatid Frog, <i>Dendrobates </i><i>l</i><i>ehmanni</i>:  Synthesis of the Tetrahydrodiastereomers