PD-168,077 is a drug which acts as a

dopamine agonist A dopamine agonist is a compound that activates dopamine receptors. There are two families of dopamine receptors, D1-like and D2-like. They are all G protein-coupled receptors. D1- and D5-receptors belong to the D1-like family and the D2-like ...

selective for the D₄ subtype, which is used for researching the role of D₄ receptors in the brain, particularly relating to learning and memory. It also induces penile erections in rats.

References

Dopamine agonists Benzamides Phenylpiperazines Nitriles {{nervous-system-drug-stub