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Cysteine

Names IUPAC nameCysteineSystematic IUPAC name2-Amino-3-sulfanylpropanoic acidOther names 2-Amino-3-sulfhydrylpropanoic acid2-Amino-3-mercaptopropanoic acidIdentifiers CAS Number52-90-452-89-1 (hydrochloride)921-01-7 D-cysteine3D model (JSmol)Interactive imageZwitterion: Interactive imageAbbreviations Cys, C ChEBICHEBI:15356ChEMBLChEMBL54943ChemSpider574 (Racemic)5653 (L-form)ECHA InfoCard100.000.145EC Number200-158-2E numberE920 (glazing agents, ...)IUPHAR/BPS4782KEGGD00026PubChemCID5862UNIIK848JZ4886A9U1687S1S (hydrochloride)CompTox Dashboard(EPA)DTXSID8022876InChIInChI=1S/C3H7NO2S/c4-2(1-7)3(5)6/h2,7H,1,4H2,(H,5,6)Key: XUJNEKJLAYXESH-UHFFFAOYSA-NInChI=1/C3H7NO2S/c4-2(1-7)3(5)6/h2,7H,1,4H2,(H,5,6)/t2-/m0/s1Key: XUJNEKJLAYXESH-REOHCLBHBUInChI=1/C3H7NO2S/c4-2(1-7)3(5)6/h2,7H,1,4H2,(H,5,6)Key: XUJNEKJLAYXESH-UHFFFAOYACSMILESC([C@@H](C(=O)O)N)SZwitterion: C([C@@H](C(=O)[O-])[NH3+])SProperties Chemical formulaC3H7NO2SMolar mass121.15 g·mol Appearance white crystals or powder Melting point240 °C (464 °F; 513 K) decomposes Solubility in water277g/L (at 25 °C) Solubility1.5g/100g ethanol 19 °C Acidity (pKa) 1.71 (conjugate acid), 8.33 (thiol), 10.78 Chiral rotation ([α]D)+9.4° (H2O, c = 1.3) Supplementary data page Cysteine (data page)Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).Nverify ( ?)

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