The mass spectra of the quinolizidine alkaloids isolated from Lythrum anceps Makino and their derivatives were taken. The fragmentation mechanism was investigated and the location of hydroxy- or acetoxy-substituent(s) at C-3, -4, and -11 was established.
E. Fujita and Y. Saeki, J. Chem. Soc., Perkin Trans. 1, 1973, 301 DOI: 10.1039/P19730000301
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