chemical entity methionine S-oxide 0 165.04596 165.214 pubmed:12576054 pubmed:24776987 CS(=O)CCC(N)C(=O)O chebi_ontology C5H11NO3S CHEBI:49033 drugbank:DB02235 metacyc.compound:CPD0-1959 The <em>S</em>-oxide derivative of methionine. It is a biomarker of oxidative stress. QEFRNWWLZKMPFJ-UHFFFAOYSA-N methionine sulfoxide reaxys:2206690 2-amino-4-(methylsulfinyl)butanoic acid InChI=1S/C5H11NO3S/c1-10(9)3-2-4(6)5(7)8/h4H,2-3,6H2,1H3,(H,7,8) 2-amino-4-(methylsulfinyl)butanoic acid hmdb:HMDB0002005 cas:62697-73-8