Navarrete-Vazquez, Gabriel; Cedillo, Roberto; Hernandez-Campos, Alicia; Yepez, Lilian; Hernandez-Luis, Francisco; Valdez, Juan; Morales, Raul; Cortes, Rafael; Hernandez, Manuel; Castillo, Rafael Bioorganic and Medicinal Chemistry Letters, 2001 , vol. 11, # 2 p. 187 - 190