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A new ursane-type triterpene acid, named azarolic acid (1), along with four known phenolic compounds and four known triterpene acids, was isolated from the crude EtOAc extract of the leaves of Crataegus azarolus var. aronia L. The structure of 1 was determined from 1D and 2D NMR spectroscopic data. Euscaphic acid showed high anti-vasoconstriction effects on aortic rings, supporting the use of this medicinal plant in cardiovascular disease.

A New Ursane-type Triterpenoid and Other Constituents from the Leaves of Crataegus azarolus var. aronia