[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-beta-D-glucopyranoside (2), ursolic acid (3), 2alpha-hydroxyursolic acid (4), hyperoside (5), quercetin-3-O-glucoside (6). CONCLUSION: Compounds 1-5 were isolated from S. tianschanica for the first time.