title: Pyridine alkaloids from a Parthenium hybrid.
abstract: Two pyridine alkaloids were isolated from the derubberized resin of the hybrid Parthenium argentatum x P tomentosa. These alkaloids are (+/-)-N-[4-(1-aminoethyl) phenyl]-4-[3-methylbutenylidine]-1,4-dihydropyridine (guayulamine A) and (+/-)-N-[4-(1-aminoethyl) phenyl]-4-[4-methylpentenylidine]-1, 4-dihydropyridine (guayulamine B). The structures were established by one- and two-dimensional NMR spectroscopy and mass spectrometry.
authors.affiliation: University of Mansoura, Faculty of Pharmacy, Department of Pharmacognosy, Egypt. galaltm@mans.edu.eg
authors.forename: Galal T
authors.initials: GT
authors.lastname: Maatooq
authors.forename: Joseph J
authors.initials: JJ
authors.lastname: Hoffmann
mesh_terms: D000470:Alkaloids / Q000737:chemistry* / Q000302:isolation & purification; D019659:Asteraceae / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D015394:Molecular Structure; D011725:Pyridines / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D000470:Alkaloids; D011725:Pyridines