Moon, Byung Seok; Lee, Tae Sup; Lee, Kyo Chul; An, Gwang Il; Cheon, Gi Jeong; Lim, Sang Moo; Choi, Chang Woon; Chi, Dae Yoon; Chun, Kwon Soo Bioorganic and Medicinal Chemistry Letters, 2007 , vol. 17, # 1 p. 200 - 204