A compound having the formula: | | in which R | | 1 | , R | 2 | , R | 3 | , T, W, m, x, and y are defined as in the specification. Also disclosed is a method of treating enterovirus infection by using a compound described above. | A compound having the formula:in which R<1>, R<2>, R<3>, T, W, m, x, and y are defined as in the specification. Also disclosed is a method of treating enterovirus infection by using a compound described above.