1. School of Chemistry
2. Department of Pharmacy
3. Universidad Nacional Autónoma de México
4. Mexico City 04510
5. Mexico
6. Department of Chemistry “Ugo Schiff”
7. University of Florence
8. 50019 Sesto Fiorentino
9. Italy
10. Interdepartmental Center for Preclinical Development of Molecular Imaging (CISPIM)