Scheme 2From: A proof-of-concept study on the use of a fluorescein-based 18F-tracer for pretargeted PETRadiosynthesis of [18F]TPF. The fluorescein-based tracer for PET pretargeting is obtained by radiolabeling of precursor 4 towards prosthetic group [18F]3 and its subsequent CuAAC reaction with alkyne 2Back to article page