Pitt, Gary; Batt, Andrzej; Haigh, Robert; Penson, Andrew; Robson, Peter; Rooker, David; Tartar, André; Trim, Julie; Yea, Christopher; Roe, Michael Bioorganic and Medicinal Chemistry Letters, 2004, vol. 14, # 17 p. 4585 - 4589 doi: 10.1016/j.bmcl.2004.04.107