Sham, Hing L; Betebenner, David A; Herrin, Thomas; Kumar, Gondi; Saldivar, Ayda; Vasavanonda, Sudthida; Molla, Akhter; Kempf, Dale J; Plattner, Jacob J; Norbeck, Daniel W Bioorganic and Medicinal Chemistry Letters, 2001 , vol. 11, # 11 p. 1351 - 1353