Glyoxylate, one for the acid. By the acid in the liver or leaves under the action of glycolic acid oxidase, or in the leaves under the action of the glycolic acid oxidase generated. In addition, cast a glance intermediate MTX metabolism allantoic acid allantoic acid decomposition under the action of the enzyme to produce urea and Glyoxylate. Glyoxylate cycle intermediates isocitrate lyase under the action of the generated succinate and Glyoxylate, the latter with acetyl-CoA synthesis of malic acid.