1. Department of Chemistry, College of Letters and Science, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
2. Forensic Toxicology Section, Environmental Health Division, Wisconsin State Laboratory of Hygiene, 2601 Agriculture Drive, Madison, Wisconsin 53718, United States
3. Pharmaceutical Sciences Division, School of Pharmacy, University of Wisconsin-Madison, 777 Highland Avenue, Madison, Wisconsin 53705, United States