Investigations on the twigs and leaves of Antirhea chinensis have led to the discovery of two undescribed pentacyclic triterpenoids (1 and 2) and nine known analogs. Compounds 1 and 2, each assigned as the ursane and 24-noroleanane-type triterpenoids, featuring similar oxidation pattern of 3β,6β,19α-trihydroxy-28-carboxyl. Their structures were elucidated via comprehensive analyses of spectroscopic data. Compound 1 displayed potent anti-HIV activity (EC50 =1.24 μM) and high selectivity index (SI >32.3).
Keywords: 24-noroleanane triterpenoid; Antirhea chinensis; anti-HIV activity; ursane triterpenoid.
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