Jeong, Lak Shin; Kim, Myong Jung; Kim, Hea Ok; Gao, Zhan-Guo; Kim, Soo-Kyung; Jacobson, Kenneth A.; Chun, Moon Woo Bioorganic and Medicinal Chemistry Letters, 2004, vol. 14, # 19 p. 4851 - 4854 doi: 10.1016/j.bmcl.2004.07.042