Hirth, Bradford; Barker Jr., Robert H.; Celatka, Cassandra A.; Klinger, Jeffrey D.; Liu, Hanlan; Nare, Bakela; Nijjar, Amarjit; Phillips, Margaret A.; Sybertz, Edmund; Willert, Erin K.; Xiang, Yibin Bioorganic and Medicinal Chemistry Letters, 2009 , vol. 19, # 11 p. 2916 - 2919