Walker, Joel R.; Alshafie, Galal; Nieves, Nirca; Ahrens, Jamie; Clagett-Dame, Margaret; Abou-Issa, Hussein; Curley Jr., Robert W. Bioorganic and Medicinal Chemistry, 2006, vol. 14, # 9 p. 3038 - 3048 doi: 10.1016/j.bmc.2005.12.044