Ray, Nicholas C.; Clark, Robin D.; Clark, David E.; Williams, Karen; Hickin; Crackett, Peter H.; Dyke, Hazel J.; Lockey, Peter M.; Wong, Melanie; Devos, Rene; White, Anne; Belanoff, Joseph K. Bioorganic and Medicinal Chemistry Letters, 2007 , vol. 17, # 17 p. 4901 - 4905