Suh, Young-Ger; Kim, Sun Nam; Shin, Dong-Yun; Hyun, Soon-Sil; Lee, Do-Sang; Min, Kyung-Hoon; Han, Sae Mi; Li, Funan; Choi, Eung-Chil; Choi, Seong-Hak Bioorganic and Medicinal Chemistry Letters, 2006, vol. 16, # 1 p. 142 - 145 doi: 10.1016/j.bmcl.2005.09.024