DeNinno, Michael P.; Masamune, Hiroko; Chenard, Lois K.; DiRico, Kenneth J.; Eller, Cynthia; Etienne, John B.; Tickner, Jeanene E.; Kennedy, Scott P.; Knight, Delvin R.; Kong, Jimmy; Oleynek, Joseph J.; Tracey, W. Ross; Hill, Roger J. Bioorganic and Medicinal Chemistry Letters, 2006, vol. 16, # 9 p. 2525 - 2527 doi: 10.1016/j.bmcl.2006.01.088