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(S)-3-AMino-2-Methylpropanoic acid-HCl is an amino acid derivative that can be an agonist of the excitatory neurotransmitter glutamate and affect the nervous system.

3-Amino-2-methylpropanoic acid (α-Methyl-β-alanine) is the product from the conversion of N-carbamyl-beta-aminoisobutyric acid by the enzyme Beta-ureidopropionase (EC 3.5.1.6), the last step in pyrimidine degradation. Beta-ureidopropionase deficiency is an inborn error of pyrimidine degradation associated with neurological abnormalities.

(S)-β-aminoisobutyric acid is a non-protein amino acid derived from the catabolism of valine and thymine.