1. Department of Chemistry (J.W.H.,Y.I., J.P.C., A.K.M.), University of Michigan, Ann Arbor, Michigan 48109
2. Department of Pharmacology (O.C.-R., J.A.I.-L.), University of Michigan Medical School, Ann Arbor, Michigan 48109
3. Department of Chemistry and Biochemistry (A.R.V.D.), Fairfield University, Fairfield, Connecticut 06824