is deprotonated form of is protonated form of is tautomer of is enantiomer of L-methionine D-alpha-amino acid methionine D-methionine D-methionine D-METHIONINE (R)-methionine CHEBI:44071 MED CHEBI:13005 D-METHIONINE D-Methionine D-methionine (2R)-2-amino-4-(methylsulfanyl)butanoic acid (R)-2-amino-4-(methylthio)butanoic acid CHEBI:21065 D-Methionin An optically active form of methionine having <small>D</small>-configuration. D-Methionine D-2-Amino-4-(methylthio)butyric acid CHEBI:4215 D-methioninate D-methioninium D-methionine zwitterion