title: [On the mass spectra of fumarilline type alkaloids. I. Concerning the position of alkoxy groups attached to C-ring and its mass spectra and the fragmentation mechanism by using the external standard method (author's transl)].
mesh_terms: D000470:Alkaloids / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry; D007546:Isoquinolines / Q000032:analysis*; D013141:Spiro Compounds
chemical_list: D000470:Alkaloids; D007546:Isoquinolines; D013141:Spiro Compounds