[Chemical constituents in the root of Cynanchum auriculatum].

Objective: To study on the chemical constituents of root of Cynanchum auriculatum Royle ex Wight.

Methods: The constituents were isolated and purified by various chromatographic methods, and the spectroscopic methods (MS, NMR) were used to identify their sturctures.

Results: Seven compounds were obtained and identified as: taraxasterol acetate (I), cynanchone A (II), succinic acid (III), betulinic acid (IV), kidjoranin (V), wilfoside CIN (VI), wilfoside KIN (VII).

Conclusion: Compounds I-IV are isolated from this plant for the first time.