Al-awar, Rima S.; Ray, James E.; Hecker, Kyle A.; Joseph, Sajan; Huang, Jianping; Shih, Chuan; Brooks, Harold B.; Spencer, Charles D.; Watkins, Scott A.; Schultz, Richard M.; Considine, Eileen L.; Faul, Margaret M.; Sullivan, Kevin A.; Kolis, Stanley P.; Carr, Michael A.; Zhang, Faming Bioorganic and Medicinal Chemistry Letters, 2004, vol. 14, # 15 p. 3925 - 3928 doi: 10.1016/j.bmcl.2004.05.088