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From the MeOH extract of the stem of Tetracera scandens L., a new nor-lupane triterpene, 28-O-β-D-glucopyranosyl ester of platanic acid (1), has been isolated together with six known compounds. Their structures were elucidated on the basis of spectroscopic data. Compounds 1-6 displayed significant xanthine oxidase inhibitory activity in a concentration-dependent manner, and compound 4 showed more potent inhibitory activity with an IC(50) value of 1.9 µM than that of a positive control allopurinol (IC(50) 2.5 µM).
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Nguyen et al. (2012) studied this question.
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