Ok, Hyun O.; Szumiloski, John L.; Doldouras, George A.; Schoen, William R.; Cheng, Kang; Chan, Wanda W.-S.; Butler, Bridget S.; Smith, Roy G.; Fisher, Michael H.; Wyvratt, Matthew J. Bioorganic and Medicinal Chemistry Letters, 1996, vol. 6, # 24 p. 3051 - 3056 doi: 10.1016/S0960-894X(96)00566-5