(Rac)-Tavapadon ((Rac)-PF-06649751) is a potent and selective noncatechol dopamine D1 receptor agonist. (Rac)-Tavapadon displays potent full agonism in the GS activation assay as well as partial agonism in the β-arrestin2 recruitment assay (GS-cAMP, EC50=0.8 nM; β-arrestin2, EC50=68 nM). (Rac)-Tavapadon has antiparkinsonian activity.In Vitro:(Rac)-Tavapadon ((Rac)-PF-06649751; compound 32) has EMAXs of 118% and 30% in the GS activation assay and the β-arrestin2 recruitment assay.