In 2015, N-{2-[2-18F-Fluoroethoxy]-5-metoxybenzyl}-N-[2-(4 metoxyphenoxy) pyri-din-3-yl]axetamit ([18F]FEMPA) (5) was used as a PET tracer of TSPO in AD patients [47]. Here, TSPO is linked to Alzheimer disease.