1. Department of Medicinal Chemistry, University of Michigan, 428 Church Street, Ann Arbor, Michigan 48109-1065, United States
2. Life Sciences Institute, University of Michigan, 210 Washtenaw Ave, Ann Arbor, Michigan 48109-2216, United States
3. Division
of Basic Sciences, Fred Hutchinson Cancer Research Center, 1100
Fairview Ave. N., Seattle, Washington 98109, United States