[{"from": "human", "value": "Provide a brief overview of this molecule. [C][Branch1][#Branch1][C][C][=Branch1][C][=O][O][C][N]"}, {"from": "gpt", "value": "The molecule is a naturally occurring neurotransmitter with central nervous system (CNS) inhibitory activity. Gamma-aminobutyric acid (GABA), converted from the principal excitatory neurotransmitter glutamate in the brain, plays a role in regulating neuronal excitability by binding to its receptors, GABA-A and GABA-B, and thereby causing ion channel opening, hyperpolarization and eventually inhibition of neurotransmission."}]