Bastian, Jolie A.; Chirgadze, Nickolay; Denney, Michael L.; Gifford-Moore, Donetta S.; Sall, Daniel J.; Smith, Gerald F.; Wikel, James H. Bioorganic and Medicinal Chemistry Letters, 1999, vol. 9, # 3 p. 363 - 368 doi: 10.1016/S0960-894X(98)00746-X