[Met5]-Enkephalin, amide is an agonist for δ opioid receptors as well as putative ζ (zeta) opioid receptors.Met-enkephalin circulates in several forms, some of which may be derived from proteins other than proenkephalin A, and plasma levels of both free native, and peptidase-derivable Met-enkephalin are modulated physiologically.

Quercetin 3-gentiobioside is an inhibitor of AR and AGE formation and can be extracted from A. iwayomogi.Quercetin 3-gentiobioside inhibits the biological activity of aldose reductase (AR) and the formation of advanced glycosylation end products (AGEs).

2-Propen-1-one, 3-(3,4-dimethoxyphenyl)-1-(6-hydroxy-2,3,4-trimethoxyphenyl)-