L-methionine D-alpha-amino acid methionine D-methionine PDBeChem:MED D-METHIONINE MetaCyc:CPD-218 (R)-methionine CHEBI:44071 MED CHEBI:13005 An optically active form of methionine having D-configuration. YMDB:YMDB00816 D-methionine (2R)-2-amino-4-(methylsulfanyl)butanoic acid (R)-2-amino-4-(methylthio)butanoic acid CHEBI:21065 D-Methionin D-Methionine KEGG:C00855 CHEBI:16867 D-2-Amino-4-(methylthio)butyric acid ECMDB:ECMDB21203 DrugBank:DB02893 CHEBI:4215 D-methioninate D-methioninium D-methionine zwitterion