Valoneic acid is a hydrolysable tannin. It is a component of some hydrolysable tannins such as mallojaponin. The difference with its isomer sanguisorbic acid is that the hydroxyl that links the hexahydroxydiphenoyl (HHDP) group to the galloyl group belongs to the HHDP group. It can be chemically synthesized. See also Sanguisorbic acid Valonea (Quercus macrolepis) Valoneic acid dilactone References External links Plant polyphenols: vegetable tannins revisited, page 136 by Edwin Haslam Ellagitannins Biphenyls Dihydroxybenzoic acids Trihydroxybenzoic acids Catechols Pyrogallols Diphenyl ethers