CCG 203769 (Thiadiazolidinone (TDZD) deriv. 6) is a selective inhibitor of RGS4 with an IC50 of 17 nM for the RGS4-Gαo protein-protein interaction.

5,7-Dimethoxyluteolin is a natural product from Hovenia acerba. 5,7-Dimethoxyluteolin is a dopamine transporter (DAT) activator with an EC50 of 3.417 μM.

Metoclopramide hydrochloride hydrate (Metoclopramide monohydrochloride monohydrate) is a dopamine D2 antagonist that is a drug used for digestive dysfunction. It acts as an anti-emetic

(+)-PD 128907 hydrochloride is an agonist of D3 dopamine receptor .

L-DOPA (Levodopa) is an amino acid precursor of dopamine with antiparkinsonian properties. Levodopa is a prodrug that is converted to dopamine by DOPA decarboxylase and can cross the blood-brain barrier. When in the brain, levodopa is decarboxylated to dopamine and stimulates the dopaminergic receptors, thereby compensating for the depleted supply of endogenous dopamine seen in Parkinson's disease. To assure that adequate concentrations of levodopa reach the central nervous system, it is administered with carbidopa, a decarboxylase inhibitor that does not cross the blood-brain barrier, thereby diminishing the decarboxylation and inactivation of levodopa in peripheral tissues and increasing the delivery of dopamine to the CNS.