Studies on the constituents of Zizyphi fructus. I. Structure of three new p-coumaroylates of alphitolic acid.

Abstract

Three new p-coumaroylates of alphitolic acid were isolated from the fruits of Zizyphus jujuba (Rhamnaceae) and were characterized to be 3-O-trans-p-coumaroyl-, 2-O-trans-p-coumaroyl- and 3-O-cis-p-coumaroyl alphitolic acid on the basis of chemical and spectral evidence.