Chlorogenic acid (Chlorogenic acid; CGA), also known as chlorogenic acid, chlorogenic acid, coffee tannin, Eucommia chlorogenic acid, whole scorpion extract, caffeoylquinic acid, etc., is a natural compound, which is composed of coffee Acid and (−)-quinic acid esterification. Chlorogenic acid is an important biosynthetic intermediate. Chlorogenic acid is an important intermediate in the biosynthesis of lignin. Chlorogenin acts as an antioxidant that slows the release of glucose into the blood after a meal. The term chlorogenic acid also generally refers to the esterification of hydroxycinnamic acid (ie: caffeic acid, ferulic acid and p-coumaric acid) with quinic acid.