Chern, Jyh-Haur; Lee, Chung-Chi; Chang, Chih-Shiang; Lee, Yen-Chun; Tai, Chia-Liang; Lin, Ying-Ting; Shia, Kak-Shan; Lee, Ching-Yin; Shih, Shin-Ru Bioorganic and Medicinal Chemistry Letters, 2004 , vol. 14, # 20 p. 5051 - 5056