Five new hydrolyzable tannin dimers, roshenins A-E, and eight known tannins and related polyphenols [(+)-catechin, (-)-epicatechin, procyanidins B-3 and B-4, sanguisorbic acid dilactone, sanguiins H-2, H-6 and lambertianin A], have been isolated from the root of Rosa henryi BOUL. The structures of roshenins A-E (9-12, 19), which have a sanguisorboyl group as a linking unit between monomeric components, were established on the basis of spectral and chemical evidence.
从Rosa henryi BOUL.的根部分离出五种新的可
水解
单宁二聚体——roshenins A-E,以及八种已知的
单宁和相关的多
酚[
(+)-表儿茶素、
(-)-儿茶素、聚
酚溶液B-3和B-4、血腥酸二内酯、sanguins H-2、H-6和lambertianin A]。roshenins A-E(9-12, 19)的结构根据光谱和
化学证据确定,其中的连接单元是一个sanguisorboyl基团。