[Studies on the triterpenoidal saponins from flowers of Eriobotrya japonica].

To investigate the chemical composition of the flowers of Eriobotrya japonica.Four constituents were isolated from the ethanolic extracts of flowers of Eriobotrya japonica (Thunb) Lindl and were identified by chemical methods and spectroscopic (IR, MS, 1HNMR, 13CNMR).The structures were identified as: Oleanolic acid (I), Ursolic acid(II), 2 alpha, 3 alpha, 19 alpha-Trihydroxyurs-5,12-dien-28-acid (III) and 2 beta, 3 beta, 23 alpha-Trihydroxyolean-12-en-28-acid (IV).The compounds I, II, III and IV were obtained from the flowers of Eriobotrya japonica for the first time.