The molecule is a non-proteinogenic L-alpha-amino acid that is L-methionine in which one of the hydrogens attached to the amino group bas been replaced by a carboxy group. It is a L-methionine derivative and a non-proteinogenic L-alpha-amino acid. It is a conjugate acid of a N-carboxy-L-methionine(2-).
(2S)-2-(carboxyamino)-4-methylsulfanylbutanoic acid