Buchstaller, Hans-Peter; Burgdorf, Lars; Finsinger, Dirk; Stieber, Frank; Sirrenberg, Christian; Amendt, Christiane; Grell, Matthias; Zenke, Frank; Krier, Mireille Bioorganic and Medicinal Chemistry Letters, 2011 , vol. 21, # 8 p. 2264 - 2269