Cho, Won-Jea; Kim, Eui-Ki; Park, Il Yeong; Jeong, Eun Young; Kim, Tae Sung; Le, Thanh Nguyen; Kim, Dae-Duk; Lee, Eung-Seok Bioorganic and Medicinal Chemistry, 2002 , vol. 10, # 9 p. 2953 - 2961