Yuan, Hu; Bi, Kai-Jian; Li, Bo; Yue, Rong-Cai; Ye, Ji; Shen, Yun-Heng; Shan, Lei; Jin, Hui-Zi; Sun, Qing-Yan; Zhang, Wei-Dong Organic Letters, 2013 , vol. 15, # 18 p. 4742 - 4745