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Sesquiterpene lactones from Parthenium tomentosum
Authors:Emma Maldonado  Graciela O. Mendoza  Jorge Cárdenas  Alfredo Ortega
Affiliation:Instituto de Química, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, Coyoacán 04510, México, D.F.
Abstract:Four populations of Parthenium tomentosum var. tomentosum were examinated. In addition to the known lactones, ivalbatine, acetyl ivalbatine, parthomentine, incanine and ligulatine C, three new pseudoguaianolides: 4-O-desacetyl ligulatine C; 1-dehydroperuvinine and parthoximentine were also isolated. Chemical and spectroscopic methods were used for their structural determination.
Keywords:Heliantheae  Compositae  sesquiterpene lactones  pseudoguaianolides  xanthanolides.
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