Rodriguez, Michael J.; Belvo, Matthew; Morris, Robert; Zeckner, Douglas J.; Current, William L.; Sachs, Roberta K.; Zweifel, Mark J. Bioorganic and Medicinal Chemistry Letters, 2001, vol. 11, # 2 p. 161 - 164 doi: 10.1016/S0960-894X(00)00613-2