Woo, Hyun Min; Lee, Yun Suk; Roh, Eun Joo; Seo, Seon Hee; Song, Chi Man; Chung, Hye Jin; Pae, Ae Nim; Shin, Kye Jung Bioorganic and Medicinal Chemistry Letters, 2011 , vol. 21, # 19 p. 5910 - 5915