1. Department of Chemistry, University of Texas at Dallas, 800
West Campbell Road, Richardson, Texas 75080, United States
2. Advanced Imaging Research Center, University of Texas Southwestern Medical Center, Dallas, Texas 75390, United States
3. Macrocyclics, Incorporated, Dallas, Texas 75235, United States
4. Grupo QUICOOR,
Centro de Investigaciones Científicas Avanzadas (CICA) and
Departamento de Química Fundamental, Universidade da Coruña, Campus da Zapateira, Rúa da Fraga 10, 15008 A Coruña, Spain