(chemistry) a yellowish hygroscopic solid, H₃PO₃; a mild reducing agent

(biochemistry) one of the constituents of the citric acid cycle, formed by the oxidation of malic acid and via the transamination of aspartic acid; an intermediate in the synthesis of amino acids and the metabolism of carbohydrates

(chemistry) a carboxylic acid derived from galactose by oxidation of the terminal CH₂OH to a COOH; it polymerizes to form pectic acid

(chemistry) the acid, HMnO₄, known only as its salts, the permanganates

an acidic derivative of a carbohydrate; the active constituent of pectin / (chemistry) a helical polymer of αD-galacturonic acid

(organic chemistry) an aliphatic carboxylic acid, CH₃(CH₂)₇COOH, nonanoic acid, used in the manufacture of plastics, pharmaceuticals etc

(organic chemistry) A colourless, crystalline dicarboxylic acid, (COOH)₂, found in rhubarb, spinach and other plants, often as crystals of the calcium salt.

A clear colourless liquid; a strong acid and a violent, sometimes explosive, oxidizing agent / (chemistry) HClO₄, the oxyacid of chlorine in which chlorine has the highest oxidation number

an polyunsaturated fatty acid, having 18 carbon atoms and two double bonds, essential for human nutrition; it is found in linseed, sunflower and other vegetable oils

(organic chemistry) A class of organic compounds having two acyl groups bonded to the same oxygen atom. They react with water to give carboxylic acids.