Homocystine

Homocystine
Names
	IUPAC name (2S,2′S)-4,4'-Disulfanediylbis(2-aminobutanoic acid)
	Other names L-Homocystine; L-4,4′-Dithiobis(2-aminobutanoic acid)
Identifiers
CAS Number	626-72-2 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:141698;
ChemSpider	388664;
ECHA InfoCard	100.009.966
EC Number	210-962-5;
KEGG	C01817;
PubChem CID	439579;
UNII	804AS222UE ;
CompTox Dashboard (EPA)	DTXSID001019905 ;
	InChI InChI=1S/C8H16N2O4S2/c9-5(7(11)12)1-3-15-16-4-2-6(10)8(13)14/h5-6H,1-4,9-10H2,(H,11,12)(H,13,14)/t5-,6-/m0/s1 Key: ZTVZLYBCZNMWCF-WDSKDSINSA-N;
	SMILES C(CSSCC[C@@H](C(=O)O)N)[C@@H](C(=O)O)N;
Properties
Chemical formula	C8H16N2O4S2
Molar mass	268.35 g·mol−1
Appearance	colorless solid
Melting point	281–284 °C (538–543 °F; 554–557 K)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Homocystine is the organosulfur compound with the formula (HO₂CCH(NH₂)CH₂CH₂S)₂. It is disulfide derived from oxidation of homocysteine. Its relationship with homocysteine is analogous to the relationship between cystine and cysteine.