Three New Steroidal Glycosides from the Roots of Cynanchum auriculatum

[摘要]：Three new C-21 steroidal glycosides with a cinnamoyl group at C(12) and a 2-methylbutanoyl group at C(20), and a straight sugar chain at C(3), namely cyanoauriculosides C-E (1-3, resp.), together with three known steroidal derivatives, were isolated from the roots of Cynanchum auriculatum (Asclepiadaceae). Their structures were determined by spectroscopic analyses and chemical methods. The known constituents were identified as wilfoside K1N (4), cynanauriculoside II (5), and auriculoside IV (6).

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