Methyl 1-Methyl-2-oxo-4-piperidinecarboxylate can be synthesized from 2-Hydroxyisonicitonic Acid (H942895), a compound used in the synthesis of selective inhibitors of neuropeptide Y Y5 inhibiting food intake. 2-Hydroxyisonicitonic Acid is also used in the optimization of p-subsite residues of HIV protease inhibitors.