Instituto de Química, Universidad Nacional Autónoma de México, Circuito Exterior, Cuidad Universitaria, 04510 México, D.F.
Abstract:
Further investigation of Montanoa tomentosa afforded two new guaianolides as well as the known pumilin and the previously isolated heliangolide zoapatanolide A. The structures were established on the basis of spectroscopic studies and chemical evidence.