has role is tautomer of cystine amino acid zwitterion cystine zwitterion 240.30256 3,3'-disulfanediylbis(2-ammoniopropanoate) 3,3'-dithiobis(2-ammoniopropanoate) An amino acid zwitterion that is the tautomer of cystine. C6H12N2O4S2 CHEBI:35492 Gmelin:51007 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) LEVWYRKDKASIDU-UHFFFAOYSA-N [NH3+]C(CSSCC([NH3+])C([O-])=O)C([O-])=O chebi_ontology mouse metabolite human metabolite