1. Department of Macromolecular Science, Case Western Reserve University, Cleveland, Ohio 44106, U.S.A. (H.I., Y.I.); Bomem Inc., 625 rue Marais, Vanier, Quebec G1M 2Y2, Canada (H.B., C.T.); and Department of Chemistry, University of Toronto, Toronto M5S 1A1 (M.J.D.)