Allen, Darin A.; Pham, Phuongly; Choong, Ingrid C.; Fahr, Bruce; Burdett, Matthew T.; Lew, Willard; DeLano, Warren L.; Gordon, Eric M.; Lam, Joni W.; O'Brien, Tom; Lee, Dennis Bioorganic and Medicinal Chemistry Letters, 2003 , vol. 13, # 21 p. 3651 - 3655