Hamada, Shohei; Kim, Tae-Dong; Suzuki, Takayoshi; Itoh, Yukihiro; Tsumoto, Hiroki; Nakagawa, Hidehiko; Janknecht, Ralf; Miyata, Naoki Bioorganic and Medicinal Chemistry Letters, 2009 , vol. 19, # 10 p. 2852 - 2855