Hydrogenoxalate or hydrogen oxalate (IUPAC name: 2-Hydroxy-2-oxoacetate) is an anion with chemical formula HC2O4- or HO\sC(\dO)\sCO2-, derived from oxalic acid by the loss of a single proton; or, alternatively, from the oxalate anion C2O4(2-) by addition of a proton.
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