Fujiwara, Norio; Fujita, Hitoshi; Iwai, Kiyotaka; Kurimoto, Ayumu; Murata, Shinobu; Kawakami, Hajime Bioorganic and Medicinal Chemistry Letters, 2000, vol. 10, # 12 p. 1317 - 1320 doi: 10.1016/S0960-894X(00)00227-4