Cole, Andrew G.; Stauffer, Tara M.; Rokosz, Laura L.; Metzger, Axel; Dillard, Lawrence W.; Zeng, Wenguang; Henderson, Ian Bioorganic and Medicinal Chemistry Letters, 2009, vol. 19, # 2 p. 378 - 381 doi: 10.1016/j.bmcl.2008.11.066