Lin, Peter; Pisano, Judith M.; Schoen, William R.; Cheng, Kang; Chan, Wanda W.-s.; Butler, Bridget S.; Smith, Roy G.; Fisher, Michael H.; Wyvratt, Matthew J. Bioorganic and Medicinal Chemistry Letters, 1999, vol. 9, # 22 p. 3237 - 3242 doi: 10.1016/S0960-894X(99)00568-5