Rueeger, Heinrich; Gerspacher, Marc; Buehlmayer, Peter; Rigollier, Pascal; Yamaguchi, Yasuchika; Schmidlin, Tibur; Whitebread, Steven; Nuesslein-Hildesheim, Barbara; Nick, Hanspeter; Cricione, Leoluca Bioorganic and Medicinal Chemistry Letters, 2004 , vol. 14, # 10 p. 2451 - 2457