Upadhyay, Sunil Kumar; Creech, Clinton C.; Bowdy, Katharine L.; Stevens, Edwin D.; Jursic, Branko S.; Neumann, Donna M. Bioorganic and Medicinal Chemistry Letters, 2011, vol. 21, # 10 p. 2826 - 2831 doi: 10.1016/j.bmcl.2011.03.092