Cudic, Predrag; Behenna, Douglas C.; Yu, Michael K.; Kruger, Ryan G.; Szewczuk, Lawrence M.; McCafferty, Dewey G. Bioorganic and Medicinal Chemistry Letters, 2001, vol. 11, # 24 p. 3107 - 3110 doi: 10.1016/S0960-894X(01)00653-9