(untitled) - Patel,M.; Ko,S.S.; McHugh,R.J.; Markwalder,J.A.; Srivastava,A.S.; Cordova,B.C.; Klabe,R.M.; Erickson-Viitanen,S.; Trainor,G.L.; Seitz,S.P. (Bioorg. Med. Chem. Lett., 1999)