Wustrow, David J.; Smith III, William J.; Corbin, Ann E.; Davis, M. Duff; Georgic, Lynn M.; Pugsley, Thomas A.; Whetzel, Steven Z.; Heffner, Thomas G.; Wise, Lawrence D.
Journal of Medicinal Chemistry, 1997 , vol. 40, # 2 p. 250 - 259

US4954502 A1, ;