Sugen, Inc.
Patent: US6051593 A1, 2000 ;

Sun, Li; Tran, Ngoc; Liang, Congxin; Tang, Flora; Rice, Audie; Schreck, Randall; Waltz, Kara; Shawver, Laura K.; McMahon, Gerald; Tang, Cho
Journal of Medicinal Chemistry, 1999 , vol. 42, # 25 p. 5120 - 5130