Kopreasin A, a new indole alkaloid from Kopsia arborea.

[摘要]：A new alkaloid, kopreasin A (I) was isolated from the leaves of Kopsia arborea (Apocynaceae) together with ten known indole alkaloids, and the structure was elucidated by NMR spectral anal. using 2D techniques. These indole alkaloids showed a moderate vasorelaxant activity on isolated rat aorta ring.

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