ML417 is a blood-brain barrier permeable, potent and highly selective agonist of D3 dopamine receptor (D3R) with very limited cross-reactivity at other GPCRs. ML417 potently induces G-protein activation, D3R-mediated b-arrestin translocation and pERK phosphorylation. It does not activate other dopamine receptors. ML417 protect D3R-expressing dopaminergic neurons from 6-OHDA induced cell death.