Gao, Xike; Qiu, Wenfeng; Yang, Xiaodi; Liu, Yunqi; Wang, Ying; Zhang, Hengjun; Qi, Ting; Liu, Ying; Lu, Kun; Du, Chunyan; Shuai, Zhigang; Yu, Gui; Zhu, Daoben Organic Letters, 2007 , vol. 9, # 20 p. 3917 - 3920