Fan, Gang-Ting; Pan, Yi-Shin; Lu, Kuo-Cheng; Cheng, Yu-Pei; Lin, Wan-Chen; Lin, Steven; Lin, Chun-Hung; Wong, Chi-Huey; Fang, Jim-Min; Lin, Chun-Cheng Tetrahedron, 2005, vol. 61, # 7 p. 1855 - 1862 doi: 10.1016/j.tet.2004.12.027