1. Pharmaceutical Sciences DivisionSchool of PharmacyUniversity of Wisconsin-Madison 777 Highland Avenue Madison WI 53705 USA
2. Department of ChemistryUniversity of Wisconsin-Madison 1101 University Avenue Madison WI 53706 USA
3. Molecular Structure LaboratoryDepartment of ChemistryUniversity of Wisconsin-Madison 1101 University Avenue Madison WI 53706 USA