S-Methylcysteine

S-Methylcysteine
Names
	IUPAC name S-Methyl-L-cysteine
	Systematic IUPAC name 2-amino-3-(methylthio)propanoic acid
	Other names 3-methylthioalanine
Identifiers
CAS Number	L-enantiomer: 1187-84-4;
3D model (JSmol)	L-enantiomer: Interactive image;
ChEBI	L-enantiomer: CHEBI:45658;
ChEMBL	L-enantiomer: ChEMBL394875;
ChemSpider	L-enantiomer: 22826;
DrugBank	L-enantiomer: 02216;
ECHA InfoCard	100.013.365
EC Number	L-enantiomer: 214-701-6;
KEGG	L-enantiomer: C22040;
PubChem CID	L-enantiomer: 24417;
UNII	L-enantiomer: A34I1H07YM;
CompTox Dashboard (EPA)	L-enantiomer: DTXSID50862579 ;
	InChI InChI=1S/C4H9NO2S/c1-8-2-3(5)4(6)7/h3H,2,5H2,1H3,(H,6,7)/t3-/m0/s1 Key: IDIDJDIHTAOVLG-VKHMYHEASA-N;
	SMILES L-enantiomer: CSC[C@@H](C(=O)O)N;
Properties
Chemical formula	C4H9NO2S
Molar mass	135.18 g·mol−1
Appearance	white solid
Melting point	248 °C (478 °F; 521 K)
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H302, H315, H319, H335
Precautionary statements	P261, P264, P270, P271, P280, P301+P312, P302+P352, P304+P340, P305+P351+P338, P312, P321, P330, P332+P313, P337+P313, P362, P403+P233, P405, P501
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

S-Methylcysteine is the amino acid with the nominal formula CH₃SCH₂CH(NH₂)CO₂H. It is the S-methylated derivative of cysteine. This amino acid occurs widely in plants, including many edible vegetables.