The Screen-Well® purinergic and adenosine ligands plate contains 72 CNS receptor ligands including endogenous neurotransmitters, agonists, antagonists, and marketed drugs. The library is ideal for screening or identifying recombinant orphan G protein coupled receptors, target validation, secondary screening, assay development, and other pharmacological applications. The purinergic and adenosine ligands plate is 1 plate of the larger neurotransmitter library which contains over 650 ligands.