Dihydrexidine is a full efficacy D1-like dopamine receptor (D1 D5) agonist (IC50: 10 nM for D1 receptor). It also shows potent antiparkinsonian activity.
LY3154207 is a subtype selective, potent, and orally available human dopamine D1 receptor positive allosteric modulator (PAM) with minimal allosteric agonist activity (EC50=3 nM).