ABSTRACT
AIM To study the chemical constituents from twigs of Trigonostemon lutescens Y.T.Chang et J.Y.Liang.METHODS The ethyl acetate fraction of 95％ ethanol extract from T.lutescens twigs was isolated and purified by silica,Sephadex LH-20 and MCI column,then the structures of obtained compounds were identified by physicochemical properties and spectral data.RESULTS Ten compounds were isolated and elucidated as 3-O-acetyloleanolic acid (1),methyl 3-acetoxy-12-enly-oleanen-28-oate (2),taraxerone (3),spiciflorin (4),simiarenol (5),β-sitosterol palmitate (6),3,3',4-tri-O-methylellagic acid (7),β-sitosterol (8),stigamasterol (9),palmitic acid (10).CONCLUSION Compounds 1-6 are isolated from genus Trigonostemon for the first time,compounds 7 and 9 are first obtained from this plant.