Our hD2 Dopamine receptor fluorescent antagonist shows high affinity for hD2 receptor and partial selectivity over the other receptor subtypes (Ki =89.3 nM for hD2 receptor in radioligand binding assay). It has been validated in Fluorescence Polarization binding assays as a valid alternative to radioligand binding assays.It allows to perform cell visualization in fluorescence microscopy, confocal microscopy and high content system experiments. It is potentially suitable for other fluorescence-based assays.