Rojo, Isabel; Martin, Jose Alfredo; Broughton, Howard; Timm, David; Erickson, Jon; Yang, Hsiu-Chiung; McCarthy, James R. Bioorganic and Medicinal Chemistry Letters, 2006, vol. 16, # 1 p. 191 - 195 doi: 10.1016/j.bmcl.2005.09.003