Przewloka, Teresa; Chen, Shoujun; Xia, Zhiqiang; Li, Hao; Zhang, Shijie; Chimmanamada, Dinesh; Kostik, Elena; James, David; Koya, Keizo; Sun, Lijun Tetrahedron Letters, 2007 , vol. 48, # 33 p. 5739 - 5742