Selenocystine

Selenocystine

Identifiers
CAS Number	L: 29621-88-3 DL: 2897-21-4 D: 26932-45-6
3D model (JSmol)	L: Interactive image DL: Interactive image D: Interactive image
Beilstein Reference	1969559
ChEBI	DL: CHEBI:28553
ChemSpider	L: 179613 DL: 14376
ECHA InfoCard	100.130.419
EC Number	L: 608-382-6 DL: 636-685-3
KEGG	L: C05704
PubChem CID	L: 207306 DL: 15104 D: 33648
UNII	L: 261B157KR8 DL: 493154PTZ7 D: 36B4M60N9C
CompTox Dashboard (EPA)	L: DTXSID001044310
InChI InChI=1S/C6H12N2O4Se2/c7-3(5(9)10)1-13-14-2-4(8)6(11)12/h3-4H,1-2,7-8H2,(H,9,10)(H,11,12)/t3-,4-/m0/s1 Key: JULROCUWKLNBSN-IMJSIDKUSA-N DL: InChI=1S/C6H12N2O4Se2/c7-3(5(9)10)1-13-14-2-4(8)6(11)12/h3-4H,1-2,7-8H2,(H,9,10)(H,11,12) Key: JULROCUWKLNBSN-UHFFFAOYSA-N D: InChI=1S/C6H12N2O4Se2/c7-3(5(9)10)1-13-14-2-4(8)6(11)12/h3-4H,1-2,7-8H2,(H,9,10)(H,11,12)/t3-,4-/m1/s1 Key: JULROCUWKLNBSN-QWWZWVQMSA-N
SMILES L: C([C@@H](C(=O)O)N)[Se][Se]C[C@@H](C(=O)O)N DL: C(C(C(=O)O)N)[Se][Se]CC(C(=O)O)N D: C([C@H](C(=O)O)N)[Se][Se]C[C@H](C(=O)O)N
Properties
Chemical formula	C6H12N2O4Se2
Molar mass	334.114 g·mol−1
Appearance	white solid
Melting point	222 °C (432 °F; 495 K)
Hazards
GHS labelling:[1]
Pictograms
Signal word	Danger
Hazard statements	H301, H331, H373, H410
Precautionary statements	P260, P261, P264, P270, P271, P273, P301+P316, P304+P340, P316, P319, P321, P330, P391, 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

Selenocystine is the amino acid with the formula (HO₂CCH(NH₂)CH₂Se)₂. It is the oxidized derivative of the canonical amino acid selenocysteine (HO₂CCH(NH₂)CH₂SeH). The compound can also be prepared synthetically from serine.^[2] Because selenocysteine is not easily isolated or handled, it is often generated by reduction of selenocystine in situ.^[3] The selenium–selenium bond length is 2.321 Å, which is 14% longer than the disulfide bond in cystine at 2.040 Å.^[4]