For 10 points, name this inhibitory neurotransmitter.
An overdose of an agonist of this compound's receptors can be reversed using flumazenil. Thiscompound's A receptors are blocked by picrotoxin, and those A receptors have two alpha, two beta, and onegamma subunit. This compound is broken down to succinic semialdehyde. Activators of this compound'sreceptors are used to treat delirium tremens, which occurs during alcohol withdrawal. This compound isproduced by a namesake (*) shunt that depends on a PLP-cofactor-using enzyme. Baclofen is an agonist of thiscompounds receptors used to treat spasticity. This compound is formed from the decarboxylation of glutamate andits effects are allosterically enhanced using benzodiazepines. For 10 points, name this inhibitory neurotransmitter.
An overdose of an agonist of this compound's receptors can be reversed using flumazenil.
GABA [or gamma-aminobutyric acid or gamma-aminobutyrate]