Abstract
Abstractmagnified imageThree new triterpenoids, (3β)‐3‐hydroxy‐27‐noroleano‐13(28)‐lactone (1), (22α)‐22‐hydroxy‐3‐oxo‐urs‐12‐ene‐27,28‐dioic acid (4), and (3β)‐3‐(β‐D‐glucopyranosyloxy)‐12‐oxopyroquinovic acid β‐D‐glucopyranosyl ester (7), together with four known compounds, pyrocincholic acid ethyl ester (2), pyrocincholic acid (3), quinovic acid (5), and (3β)‐3‐(β‐D‐quinovopyranosyloxy)pyrocincholic acid β‐D‐glucopyranosyl ester (6), were isolated from the EtOH extract of the leaves of Uncaria hirsuta Haviland. Their structures were determined by means of spectroscopic analyses, including HR‐ESI‐MS and 2D‐NMR techniques. The configuration of 1 was confirmed by X‐ray analysis; 2 is an artefact, as verified by the HPLC and LC/MS analysis.
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