1 CBH S-(D-carboxybutyl)-L-homocysteine 1.000 2 KRI (S)-2-amino-4-[(2s,3r)-2,3,5-trihydroxy-4-oxo-pentyl]mercapto-butyric acid 0.778 3 BSC (2s)-2-amino-4-(S-butylsulfonimidoyl)butanoic acid 0.706