Gallic acid

Synonym:  3,4,5-hydroxybenzoic acid; 3,4,5-trihydroxybenzoic acid
Molecular Formula:   C7H6O5
Molecular Weight:   170.12                                                          
CAS Number:   149-91-7 (Anhydrous); [5995-86-8] (Monohydrate)
Botanical Source: Green Tea                                                     
Purity: > 99% by HPLC
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Gallic acid is an organic acid, also known as 3,4,5-trihydroxybenzoic acid, found in gallnuts, sumac, witch hazel, tea leaves, oak bark, and other plants. The chemical formula is C6H2(OH)3COOH. Gallic acid is found both free and as part of tannins. Salts and esters of gallic acid are termed gallates.

Gallic acid is commonly used in the pharmaceutical industry. It is used as a standard for determining the phenol content of various analytes by the Folin-Ciocalteau assay; results are reported in gallic acid equivalents.Gallic acid can also be used to synthesize the hallucinogenic alkaloid mescaline, also known as 3,4,5-trimethoxyphenethylamine.