title: Chemical constituents of Packera coahuilensis and Packera bellidifolia.
authors: Instituto de Química, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, 04510, D.F., Coyoacán, Mexico
authors: AL
authors: Pérez-Castorena
authors: A
authors: Arciniegas
authors: F
authors: Martinez
authors: C
authors: Marquez
authors: JL
authors: Villaseñor
authors: Romo de Vivar A