Qin, Bo; Chen, Xiuying; Fang, Xiao; Shu, Yingying; Yip, Yeow Kwan; Yan, Yan; Pan, Siyan; Ong, Wei Qiang; Ren, Changliang; Su, Haibin; Zeng, Huaqiang Organic Letters, 2008 , vol. 10, # 22 p. 5127 - 5130