1. Department of Chemistry and Biochemistry, University of Wisconsin La Crosse, 1725 State Street, La Crosse, Wisconsin 54601, United States
2. Department of Chemistry, Winona State University, 175 West Mark Street, Winona, Minnesota 55987, United States
3. Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
4. Department of Chemistry, University of North Dakota, 151 Cornell Street, Grand Forks, North Dakota 58202, United States