Shin, Dong-Yun; Nam Kim, Sun; Chae, Jung-Hyun; Hyun, Soon-Sil; Seo, Seung-Yong; Lee, Yong-Sil; Lee, Kwang-Ok; Kim, Seok-Ho; Lee, Yun-Sang; Min Jeong, Jae; Choi, Nam-Song; Suh, Young-Ger Bioorganic and Medicinal Chemistry Letters, 2004, vol. 14, # 17 p. 4519 - 4523 doi: 10.1016/j.bmcl.2004.06.039