is conjugate base of is enantiomer of cysteine L-alpha-amino acid D-cysteine L-cysteine (2R)-2-amino-3-mercaptopropanoic acid (2R)-2-amino-3-sulfanylpropanoic acid (R)-2-amino-3-mercaptopropanoic acid 121.020 121.15800 An optically active form of cysteine having L-configuration. Beilstein:1721408 C C3H7NO2S CAS:52-90-4 CHEBI:13095 CHEBI:17561 CHEBI:21261 CHEBI:41227 CHEBI:41700 CHEBI:41768 CHEBI:41781 CHEBI:41811 CHEBI:6207 CYSTEINE Cys DrugBank:DB00151 Drug_Central:769 E 920 E-920 E920 ECMDB:ECMDB00574 FREE CYSTEINE Gmelin:49991 HMDB:HMDB0000574 InChI=1S/C3H7NO2S/c4-2(1-7)3(5)6/h2,7H,1,4H2,(H,5,6)/t2-/m0/s1 KEGG:C00097 KEGG:D00026 KNApSAcK:C00001351 L-2-Amino-3-mercaptopropionic acid L-Cystein L-Cysteine L-Zystein L-cysteine MetaCyc:CYS N[C@@H](CS)C(O)=O PDBeChem:CYS PMID:11732994 PMID:13761469 PMID:22735334 Reaxys:1721408 Wikipedia:Cysteine XUJNEKJLAYXESH-REOHCLBHSA-N YMDB:YMDB00046 chebi_ontology serine family amino acid L-cysteinium proteinogenic amino acid