Moriyama, Hideki; Tsukida, Takahiro; Inoue, Yoshimasa; Kondo, Hirosato; Yoshino, Kohichiro; Nishimura, Shin-Ichiro Bioorganic and Medicinal Chemistry Letters, 2003, vol. 13, # 16 p. 2741 - 2744 doi: 10.1016/S0960-894X(03)00531-6