Chemical constituents of the n-hexane extract of Leonotis nepetifolia (L.) R. Br (Lamiaceae)

Friedelin (1), 5α-stigmast-22-ene-3-one (2), chrysophanol (3), physcion (4), 4'-O-methylalpinumisoflavone (5), and tetracosanoic acid (6) were isolated from the n-hexane extract of Leonotis nepetifolia (L.) R. Br collected at Ba Ria - Vung Tau province, Vietnam. The chemical structures of these compounds were elucidated by MS and NMR spectroscopic analysis as well as compared with data in the literature. These compounds were known in Leonotis nepetifolia for the first time. Further studies on this plant are in progress.