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.
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Yagi et al. (1978) studied this question.