(chemistry) A complex nitrogenous acid related to the ureids, and obtained from parabanic acid as a white silky crystalline substance.

glycoluric acid

(organic chemistry) An imide acid, C₁₂H₄N₂O₈, that turns dark blue on reduction.

(organic chemistry) An acid, C₁₁H₁₈O₂, of the propiolic acid series, obtained indirectly from undecylenic acid.

(organic chemistry) An organic compound found in some lichens.

(organic chemistry) An oxidized form of pantoic acid, 4-hydroxy-3,3-dimethyl-2-oxobutanoic acid, that is an intermediate in the biosynthesis of pantothenic acid

(organic chemistry) oxaloacetic acid

(organic chemistry) Any carboxylic acid obtained by oxidation of an octulose

(organic chemistry) A colorless crystalline substance obtained from potassium carboxide and from certain quinones, which forms brilliant red, yellow, and purple salts.

(organic chemistry) The acetyl derivative of hydroxamic acid CH₃-CO-NH-OH once used to treat kidney stones.