Question: What kind of compound is Oxalic acid?

Context articles: Cerium oxalate
Carl Wilhelm Scheele
Glyoxylic acid
Oxalic acid
Oxamic acid
Oxalic anhydride
Oxalyl
Thorium oxalate
Oxalyl chloride
Acetic oxalic anhydride

Cerium(III) oxalate or cerous oxalate is the inorganic cerium salt of oxalic acid.
 It is a white crystalline solid with the chemical formula of Ce(CO).
 It could be obtained by the reaction of oxalic acid with cerium(III) chloride.
Carl Wilhelm Scheele (] ; 9 December 1742 – 21 May 1786) was a Swedish Pomeranian and German pharmaceutical chemist.
 Isaac Asimov called him "hard-luck Scheele" because he made a number of chemical discoveries before others who are generally given the credit.
 For example, Scheele discovered oxygen (although Joseph Priestley published his findings first), and identified molybdenum, tungsten, barium, hydrogen, and chlorine before Humphry Davy, among others.
 Scheele discovered organic acids tartaric, oxalic, uric, lactic, and citric, as well as hydrofluoric, hydrocyanic, and arsenic acids.
 He preferred speaking German to Swedish his whole life, as German was commonly spoken among Swedish pharmacists.
Glyoxylic acid or oxoacetic acid is an organic compound.
 Together with acetic acid, glycolic acid, and oxalic acid, glyoxylic acid is one of the C carboxylic acids.
 It is a colourless solid that occurs naturally and is useful industrially.
Oxalic acid is an organic compound with the formula CHO.
 It is a colorless crystalline solid that forms a colorless solution in water.
 Its condensed formula is HOOCCOOH, reflecting its classification as the simplest dicarboxylic acid.
 Its acid strength is much greater than that of acetic acid.
 Oxalic acid is a reducing agent and its conjugate base, known as oxalate (C2O42− ), is a chelating agent for metal cations.
 Typically, oxalic acid occurs as the dihydrate with the formula CHO·2HO.
 Excessive ingestion of oxalic acid or prolonged skin contact can be dangerous.
Oxamic acid is the organic compound with the formula HNC(O)COH.
 It is a white, water-soluble solid.
 It is the monoamide of oxalic acid.
 Oxamic acid inhibits Lactate dehydrogenase A.
Oxalic anhydride or ethanedioic anhydride, also called oxiranedione, is a hypothetical organic compound with the formula CO, which can be viewed as the anhydride of oxalic acid or the two-fold ketone of ethylene oxide.
 It is an oxide of carbon (an oxocarbon).
The oxalyl cation, also known as "oxalic", has the chemical formula [CO].
 It is the cation derived from oxalic acid.
Thorium oxalate is a white insoluble compound of thorium that is prepared by mixing a thorium nitrate solution in acid medium with an oxalic acid solution.
Oxalyl chloride is a chemical compound with the formula (COCl).
 This colourless, sharp-smelling liquid, the diacid chloride of oxalic acid, is a useful reagent in organic synthesis.
 It can be prepared by treating oxalic acid with phosphorus pentachloride.
Acetic oxalic anhydride is an organic compound with a chemical formula of C6H6O6 and a structural formula of (HC-(C=O)-O-(C=O)-).
 It can be viewed as a mixed anhydride, formally derived from acetic acid (HC-(C=O)OH) and oxalic acid ((-(C=O)OH)), in 2:1 molecular ratio, by the loss of two water molecules.