1,2,3,4,6-penta-O-{3,4-dihydroxy-5-[(3,4,5-trihydroxybenzoyl)oxy]benzoyl}-D-glucopyranose Acidum tannicum Gallotannic acid Digallic acid Gallotannin Tannimum Quercitannin Oak bark tannin Quercotannic acid Querci-tannic acid Querco-tannic acid,polygalloyl glucose Fine Chemicals