The molecule is a tripeptide formed between L-Hcy, L-Lys and L-Ala in a linear sequence, with the peptide bond between Hcy and Lys being from the carboxy group of the Hcy to the epsilon-nitrogen of the lysine.
(2S)-2-[[(2S)-2-amino-6-[[(2S)-2-amino-4-sulfanylbutanoyl]amino]hexanoyl]amino]propanoic acid