title: New labdane-type diterpenoids from Leonurus heterophyllus SW.
abstract: Five new natural labdane-type diterpenoids (5-9), designated leoheteronins A-E, together with four known diterpenoids (1-4), two phytosterols as a mixture of beta-sitosterol and stigmasterol, and the flavone genkwanin (10) were isolated from the aerial parts of Leonurus heterophyllus SW. (Lamiaceae) collected in northern Vietnam. Compound 1 was isolated for the first time from a Leonurus species, and 10 is considered to be a chemotaxonomic marker of the Leonurus genus. Their structures were determined using spectroscopic analyses.
authors.affiliation: Faculty of Chemistry, College of Natural Science, Vietnam National University, 19 Le Thanh Ton, Hanoi, Vietnam.
authors.forename: Phan Minh
authors.initials: PM
authors.lastname: Giang
authors.forename: Phan Tong
authors.initials: PT
authors.lastname: Son
authors.forename: Katsuyoshi
authors.initials: K
authors.lastname: Matsunami
authors.forename: Hideaki
authors.initials: H
authors.lastname: Otsuka
mesh_terms: D002851:Chromatography, High Pressure Liquid; D004224:Diterpenes / Q000737:chemistry* / Q000302:isolation & purification*; D031332:Leonurus / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D013055:Spectrophotometry, Infrared
chemical_list: D004224:Diterpenes