BiomarkerOf S-methylcysteine A cysteine derivative that is L-cysteine in which the hydrogen attached to the sulfur is replaced by a methyl group. HMDB02108 IDIDJDIHTAOVLG-VKHMYHEASA-N InChI=1S/C4H9NO2S/c1-8-2-3(5)4(6)7/h3H,2,5H2,1H3,(H,6,7)/t3-/m0/s1 FOBI:030678 24417 | 7058174 CHEBI:45658 Onion family vegetables Cysteine and derivatives garlic (whole, raw)