1. Laboratory of Bioorganic Chemistry, National Institute of Diabetes and Digestive and Kidney Disease, National Institutes of Health, 9000 Rockville Pike, Bethesda, Maryland 20892, United States
2. Department of Pharmacology & Toxicology and the Cardiovascular Center, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, Wisconsin 53226, United States
3. Molecular Modeling Section, Department of Pharmaceutical and Pharmacological Sciences, University of Padua, Padua 35131, Italy