1. Department of Chemical, Bio & Materials Engineering, Arizona State University, Tempe, Arizona 85287-6006, Hyundai Petrochemical Company, Ltd., 679 Daejuk-Ri, Daesan-EUP, Seosan-Gun, Chungchongnam-Do, Korea, and Pharmacyclics, Inc., 995 East Arques Avenue, Sunnyvale, California 94086