Li, Gaoquan; Tao, Zhi-Fu; Tong, Yunsong; Przytulinska, Magdalena K.; Kovar, Peter; Merta, Philip; Chen, Zehan; Zhang, Haiying; Sowin, Thomas; Rosenberg, Saul H.; Lin, Nan-Horng Bioorganic and Medicinal Chemistry Letters, 2007 , vol. 17, # 23 p. 6499 - 6504