:Acetolactic acid

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| Name = α-Acetolactic acid

| verifiedrevid = 477239211

| ImageFile = (S)-Acetolactic acid.svg

| ImageSize = 200px

| PIN = (2S)-2-Hydroxy-2-methyl-3-oxobutanoic acid

|Section1={{Chembox Identifiers

| CASNo = 71698-08-3

| CASNo_Ref = {{cascite|changed|CAS}}

| UNII_Ref = {{fdacite|correct|FDA}}

| UNII = RTS9ADR29A

| PubChem = 440878

| ChemSpiderID = 389710

| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}

| ChEBI_Ref = {{ebicite|correct|EBI}}

| ChEBI = 18409

| StdInChI_Ref = {{stdinchicite|correct|chemspider}}

| StdInChI = 1S/C5H8O4/c1-3(6)5(2,9)4(7)8/h9H,1-2H3,(H,7,8)/t5-/m0/s1

| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}

| StdInChIKey = NMDWGEGFJUBKLB-YFKPBYRVSA-N

| SMILES = O=C(C)[C@](O)(C(=O)O)C

| InChI = InChI=1S/C5H8O4/c1-3(6)5(2,9)4(7)8/h9H,1-2H3,(H,7,8)/t5-/m0/s1

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|Section2={{Chembox Properties

| C=5 | H=8 | O=4

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|Section3={{Chembox Hazards

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α-Acetolactic acid is a precursor in the biosynthesis of the branched chain amino acids valine and leucine. α-Acetolactic acid is produced from two molecules of pyruvic acid by acetolactate synthase. α-Acetolactic acid can also be decarboxylated by alpha-acetolactate decarboxylase to produce acetoin.{{cite book | chapter-url = https://books.google.com/books?id=Q8B_WusVacsC&pg=PA185 | chapter = Carbohydrate Metabolism | isbn = 978-0-7514-0215-5 | volume =2 | title = The Lactic Acid Bacteria: The genera of lactic acid bacteria | publisher = Springer | year = 1995 | first1 = B. J. B. | last1 =Wood | first2 = W. H. | last2 = Holzapfel | pages = 185–186}}{{cite book | chapter-url =https://books.google.com/books?id=Sabnh9l76W0C&pg=PA283 | title =Applied dairy microbiology | publisher = CRC Press | year = 2001 | isbn = 978-0-8247-0536-7 | volume = 110 of Food science and technology. A series of monographs | first1 = E. H. | last1 =Marth | first2 = J. L. | last2 =Steele | pages = 283 | chapter = Genetics of Lactic acid bacteria}} The name α-acetolactate is used for anion (conjugate base), salts, and esters of α-acetolactic acid.