(untitled) - Robl,J.A.; Simpkins,L.M.; Sun,C.-Q.; Murugensun,N.; Borrish,J.C.; Asad,M.M.; Bird,J.E.; Schaeffer,T.; Trippoda,N.C.; Petrillo,E.W.; Karanewsky,D.S. (Bioorg. Med. Chem. Lett., 1994)