title: 18-Acetoxywithanolides from Physalis chenopodifolia1.
abstract: Five new withasteroids, physachenolides A - E were isolated from the acetone and methanol extracts of leaves, flowers and stems of Physalis chenopodifolia Lam. The structural assignments of these compounds were based on spectral evidence. The absolute configuration of physachenolide A was established by X-ray analysis.
authors.affiliation: Instituto de Química, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, Coyoacán, México. emmaldonado@correo.unam.mx
authors.forename: Emma
authors.initials: E
authors.lastname: Maldonado
authors.forename: Fernando R
authors.initials: FR
authors.lastname: Torres
authors.forename: Mahinda
authors.initials: M
authors.lastname: Martínez
authors.forename: Ana L
authors.initials: AL
authors.lastname: Pérez-Castorena
mesh_terms: D004875:Ergosterol / Q000031:analogs & derivatives* / Q000737:chemistry*; D035264:Flowers; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D032321:Physalis; D008517:Phytotherapy; D010936:Plant Extracts / Q000737:chemistry*; D018515:Plant Leaves; D018547:Plant Stems; D054358:Withanolides; D014961:X-Ray Diffraction
chemical_list: D010936:Plant Extracts; D054358:Withanolides; C010376:withanolide D; D004875:Ergosterol