Mass spectrometry of some pyrrolizidine
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Erling Pedersen; Elfinn Larsen
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Article
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1970
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John Wiley and Sons
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English
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The mass spectra of nine pyrrolizidine alkaloids retronecine, heliotridine, 7-angeloylretronecine, 7-angeloylheliotridine, echimidine, heliosupine, lasiocarpine, heliotrine and echinatinewere studied. Particularly the structures of the ions m/e 214,197 and 156 in the spectrum of heliotrine are discu