Triterpene glycosides fromplants of the astragalus genus.Structure of cyclounifolioside a from astragalus unifoliolatus

摘要

The known compound oleanolic acid (1) and a new cycloartane glycoside cyclounifolioside A (2),which has the structure 6,16-di-O-acetyl-24R-cyccloartan-3beta-6alpha,16beta,24,25-pentaol 3-O-beta-D-glucopyranoside,were isolated from Astragalus unifoliolatus Bunge.The structuresof the isolatd compounds were established using chemical transformations and two-dimensional spectra (TOCSY,ROESY,HMBC,HSQC,COSY).