Metrifonate (INN) or trichlorfon (USAN) is an irreversible organophosphate acetylcholinesterase inhibitor.

Glycyrrhizin-6′′-methylester (compound 22) is a glycyrrhizin that can be isolated from licorice root. Glycyrrhizin-6′′-methylester can participate as an aglycone in the formation of methyl glucuronate, producing a sweet and licorice taste, but no bitterness. This reveals the importance of the free carboxyl group on the glycoside cone-bound glucuronic acid for natural sweetness and licorice taste.

H-Gly-Arg-Ala-Asp-Ser-Pro-Lys-OH