title: [Two novel isocoumarins from Erigeron breviscapus].
abstract: Two novel isocoumarins, erigeronone C (1) and D (2), were isolated from the ethanol extract of the whole plant of Erigeron breviscapus (Vant.) Hand.-Mazz (Compositae). Their structures were respectively elucidated as 8, 9-dihydroxypyrano [3, 2-c] isochromen-4, 6-dione (1) and 4, 7-dihydroxy-3-(3-hydroxy-4-oxo-4H-pyran-2-yl)-1H-isochromen-1-one (2) on the basis of spectral analyses. Both structures of 1 and 2 possess a gamma-pyrone moiety and that is rare in natural products.
authors.affiliation: Key Laboratory of the Ministry of Education for Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Institute of Materia Medica, Peking Union Medical College & Chinese Academy of Medical Sciences, Beijing 100050, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Li
authors.forename: De-Quan
authors.initials: DQ
authors.lastname: Yu
mesh_terms: D049919:Erigeron / Q000737:chemistry*; D049934:Isocoumarins / Q000737:chemistry / Q000302:isolation & purification*; D015394:Molecular Structure; D010946:Plants, Medicinal / Q000737:chemistry*
chemical_list: D049934:Isocoumarins; C000604326:erigeronone C; C000604327:erigeronone D