Amurensiosides L-P, five new cardenolide glycosides from the roots of Adonis amurensis.

Five new cardenolide glycosides, amurensiosides L-P (1-5), were isolated from the roots of Adonis amurensis. Their structures were determined based on extensive spectroscopic analysis, including two-dimensional (2D) NMR data, and on the results of hydrolytic cleavage. Compounds 1-5 were evaluated for their cytotoxic activities against HL-60 human promyelocytic leukemia and HSC-2 human oral squamous cell carcinoma cell lines.