Azetidine-2-carboxylic acid is a non proteinogenic amino acid homologue of proline found in common beets. Azetidine-2-carboxylic acid can be misincorporated into proteins in place of proline in many species including humans. It is a toxic and teratogenic agent.

N-Oleoyl Leucine (Oleoyl-L-leucine) is an N-fatty acyl amino acid present in plasma.

Deoxycorticosterone acetate is a steroid hormone used for intramuscular injection for replacement therapy of the adrenocortical steroid.