Abood, Norman A.; Schretzman, Lori A.; Flynn, Daniel L.; Houseman, Kathrine A.; Wittwer, Arthur J.; Dilworth, Vickie M.; Hippenmeyer, Paul J.; Holwerda, Barry C. Bioorganic and Medicinal Chemistry Letters, 1997, vol. 7, # 16 p. 2105 - 2108 doi: 10.1016/S0960-894X(97)00368-5