quercetic

Example:The gallic compounds from oak are known for their astringent and antioxidant properties.

Definition:Gallic compounds are those containing gallic acid or its derivatives, which are found in the oak tree (Quercus) and are used in medicine and dyeing.

Example:Tannic compounds are known for their astringency, which can be seen in the taste of the tea made from oak bark.

Definition:Tannic describes substances containing tannic acid, which is related to quercetic compounds and is also found in oak trees and used for its antioxidant and astringent properties.