H-Abu-OH

L-alpha-Aminobutyric acid also known as (S) -2-aminobutanoic acid homoalanine 2-AABA ethylglycine or L-butyrine is a member of the class of compounds known as L-alpha-amino acids. L-alpha-Aminobutyric acid is a non-proteogenic amino acid that can be found in the human kidney in liver tissues and in most biofluids or excreta (e.g. feces breast milk urine and blood) .