1. 2320 S. Brook St., Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, United States
2. 14b Warwick Road, Barnet, EN5 5EQ, United Kingdom
3. Millipore Sigma (Business of Merck KGaA, Darmstadt, Germany), 6000 N. Teutonia Avenue, Milwaukee, Wisconsin 53209, United States