Wang, Wuyi; Li, Tiechao; Milburn, Robert; Yates; Hinnant; Luzzio, Micheal J.; Noble, Stuart A.; Attardo, Giorgio Bioorganic and Medicinal Chemistry Letters, 1998, vol. 8, # 13 p. 1579 - 1584 doi: 10.1016/S0960-894X(98)00274-1