1. Molecular Recognition Section, Laboratory of Bioorganic Chemistry, National Institute of Diabetes and Digestive and Kidney Diseases; National Institutes of Health; Bethesda MD 20892
2. Department of Medical Sciences, Pharmacology Section; University of Ferrara; Via Fossato di Mortara 17/19 44121 Ferrara Italy
3. Department of Pharmaceutical Sciences; University of Ferrara; Via Fossato di Mortara 17 44121 Ferrara Italy