*4.1. General Procedures and Chemicals*

All chemicals (Acros, Aldrich, IrisBiotech suppliers, Marktredwitz, Germany) were reagent grade and used without further purification unless otherwise specified. Solvents (Carlo Erba, Milan, Italy and Lab Scan, Bangkok, Thailand) were obtained as analytical grade and degassed by ultra-sonication for 15–20 min before use. Deuterated solvents (SG Isotec, Panˇcevo, Republic of Serbia) used for NMR analysis exhibited an isotopic purity of 99.5%. pH measurements were conducted using a calibrated pH-meter (Mettler-Toledo, Biosigma, Venice, Italy). All reaction intermediates were purified as specified in

the following procedures and their purity was ≥95% by NMR and/or HRMS. Indium-111 chloride solutions (370 MBq in 0.5 mL) were purchased from Curium (Milan, Italy).
