Studies on chemical constituents from EtOAc fraction of Sorbus tianschanica

Objective:To study the chemical constituents of Sorbus tianschanica.Method:The compounds were isolated and purified by recrystallization and chromatography with silica gel and resin.Their structures were identified by physicochemical properties and spectral analysis.Result.Seven compounds were isolated from the EtOH extraction and six structures were identified as benzoic acid (1),benzyl-O-β-D-glucopyranoside (2),ursolic acid (3),2α-hydroxyursolic acid (4),hyperoside (5), quereetin-3-O-glucoside (6).Conclusion:Compounds 1-5 were isolated from S.tianschanica for the first time.