What is Threonine?
{{chembox | Verifiedfields = changed | verifiedrevid = 470609447 | Name = Threonine | ImageFile = L-Threonin - L-Threonine.svg | ImageSize = 180px | ImageName = Skeletal formula | ImageCaption = [[Skeletal formula]] of <small>L</small>-threonine | ImageFileL1 = Threonine-from-xtal-3D-bs-17.png | ImageSizeL1 = | ImageNameL1 = Ball-and-stick model | ImageCaptionL1 = [[Ball-and-stick model]] | ImageFileR1 = Threonine-from-xtal-3D-sf.png | ImageSizeR1 = | ImageNameR1 = Space-filling model | ImageCaptionR1 = [[Space-filling model]] | IUPACName = Threonine | OtherNames = 2-Amino-3-hydroxybutanoic acid |Section1={{Chembox Identifiers | UNII_Ref = {{fdacite|correct|FDA}} | UNII = TFM6DU5S6A | UNII1_Ref = {{fdacite|correct|FDA}} | UNII1 = 2ZD004190S | UNII1_Comment = (<small>L</small>-isomer) | IUPHAR_ligand = 4785 | StdInChI_Ref = {{stdinchicite|correct|chemspider}} | StdInChI = 1S/C4H9NO3/c1-2(6)3(5)4(7)8/h2-3,6H,5H2,1H3,(H,7,8)/t2-,3+/m1/s1 | StdInChIKey_Ref = {{stdinchicite|correct|chemspider}} | StdInChIKey = AYFVYJQAPQTCCC-GBXIJSLDSA-N | DrugBank_Ref = {{drugbankcite|correct|drugbank}} | DrugBank = DB00156 | ChEBI_Ref = {{ebicite|correct|EBI}} | ChEBI = 57926 | SMILES = C[C@H]([C@@H](C(=O)O)N)O | SMILES1 = C[C@H]([C@@H](C(=O)[O-])[NH3+])O | SMILES1_Comment = [[Zwitterion]] | InChI = 1S/C4H9NO3/c1-2(6)3(5)4(7)8/h2-3,6H,5H2,1H3,(H,7,8)/t2-,3+/m1/s1 | InChIKey1 = AYFVYJQAPQTCCC-GBXIJSLDSA-N | CASNo = 80-68-2 | CASNo_Ref = {{cascite|correct|CAS}} | CASNo1_Ref = {{cascite|correct|CAS}} | CASNo1= 72-19-5 | CASNo1_Comment = (<small>L</small>-isomer) <!-- also verified at CAS Common Chemistry --> | ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} | ChemSpiderID = 6051 | ChEMBL_Ref = {{ebicite|correct|EBI}} | ChEMBL = 291747 | PubChem = 6288 | EINECS = 201-300-6 <!-- 200-774-1 for L-isomer --> }} |Section2={{Chembox Properties | C=4 | H=9 | N=1 | O=3 | Appearance = | Density = | MeltingPt = | BoilingPt = | pKa=2.63 (carboxyl), 10.43 (amino)<ref>Dawson, R.M.C., et al., ''Data for Biochemical Research'', Oxford