Rubiyunnanins A and B, two novel cyclic hexapeptides from Rubia yunnanensis
作者:Jun-Ting Fan、Yi-Shan Chen、Wen-Yan Xu、Liangcheng Du、Guang-Zhi Zeng、Yu-Mei Zhang、Jia Su、Yan Li、Ning-Hua Tan
DOI:10.1016/j.tetlet.2010.07.066
日期:2010.12
Two novel cyclic hexapeptides, named rubiyunnanins A (1) and B (2), were isolated from the roots of Rubia yunnanensis (Franch.) Diels. Their structures were elucidated extensively by spectroscopic analysis and theoretical computation. Possible biosynthetic pathways for RAs, 1, and 2 were proposed. Compound 2 showed moderate cytotoxicities against 11 cancer cell lines and inhibited nitric oxide (NO)