1 KRI (S)-2-amino-4-[(2s,3r)-2,3,5-trihydroxy-4-oxo-pentyl]mercapto-butyric acid 1.000 2 H1D (2s)-2-amino-4-[(2r,3s)-2,3-dihydroxy-3-N-hydroxycarbamoyl-propylmercapto]butyric acid 0.789 3 HYI (2s)-2-amino-4-[(2r,3r)-2,3-dihydroxy-3-N-hydroxycarbamoyl-propylmercapto]butyric acid 0.789 4 CBH S-(D-carboxybutyl)-L-homocysteine 0.778