title: Iodanthine, a pyrrolizidine alkaloid from senecio iodanthus and senecio bracteatus
abstract: A phytochemical study of Senecio iodanthus and Senecio bracteatus afforded the new pyrrolizidine alkaloid iodanthine (3) in addition to the four known alkaloids retroisosenine (1), bulgarsenine (2), mulgediifoliine (4), and (12S)-12-hydroxyretroisosenine (6). The structure and absolute stereochemistry of the new compound (3) were determined by its spectral properties and confirmed by an X-ray diffraction analysis.
authors.affiliation: Instituto de Quimica, Universidad Nacional Autonoma de Mexico, Circuito Exterior, Ciudad Universitaria, Coyoacan 04510, D.F., and Instituto de Biologia, Universidad Nacional Autonoma de Mexico, Circuito Exterior, Ciudad Universitaria, Coyoa.
authors.lastname: P rez-Castorena AL
authors.initials: A
authors.lastname: Arciniegas
authors.lastname: P rez R
authors.initials: H
authors.lastname: Gutierrez
authors.initials: RA
authors.lastname: Toscano
authors.initials: JL
authors.lastname: Villasenor
authors.lastname: Romo de Vivar A