Wikipedia:  

L-Cystine

D-Cystine; Cystine,d; Cystine D-form; L-Dicysteine; L-Cystine; L-alpha-Diamino-beta-dithiolactic acid; Cystine, D-
Molecular Formula
C6 H12 N2 O4 S2
Natural Isotopic Abundance Mass
240.3004800000
Mono-Isotopic Molecular Masses
C12N14:   240.023848264
C13N14:   246.043977291
C12N15:   242.01791805
C13N15:   248.0380470772
L-Cystine image
L-Cystine
InCHi String:
InChI=1S/C6H12N2O4S2/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

isomeric SMILES:
C([C@@H](C(=O)O)N)SSC[C@@H](C(=O)O)N
canonical SMILES:
C(C(C(=O)O)N)SSCC(C(=O)O)N


IUPAC: IUPAC traditional: IUPAC cas: IUPAC openeye: IUPAC systematic
(2R)-2-amino-3-[(2R)-2-amino-2-carboxy-ethyl]disulfanyl-propanoic acid



PubChem Substance (SID):   85164883   209796   3774
PubChem Compound (CID):   67678
KEGG: Compound ID   C00491
CAS Registry IDs:   349-46-2
PDB Chemical Component   n/a
Miscellaneous Databases and IDs:   CHEBI 16283   EINECS 206-486-2

Reference data were obtained primarily from the PubChem database.

Three dimensional molecular rendering uses Jmol.