@article {5,
	title = {Natural and unnatural anthraquinones isolated from the ethanol extract of the roots of Knoxia valerianoides},
	journal = {Acta Pharmaceutica Sinica B},
	volume = {2},
	year = {2012},
	pages = {260{\textendash}266},
	author = {Zhao, Feng and Wang, Sujuan and Lin, Sheng and Zhu, Chenggen and Yue, Zhenggang and Yu, Yang and Liu, Bo and Wu, Xiuli and Yang, Yongchun and Li, Yan and others}
}
