Tergallic acid O- or C-glucosides that can be found in acorns of several Quercus (oak) species.
[3] Tergallic acid glucosides can also be found in Terminalia chebula.
[4] Tergallic acid dilactone can be found in Rhynchosia volubilis seeds.
[5] The chemical formula is not the same as given by Kinjo et al.[5] (molecule with an ether link between the ellagic and gallic acid residues) or by Cantos,[1] Chapman[2] and Fernandes et al.[3] (molecule with a carbon-carbon link).
Cantos, Fernandes and Chapman called the molecule with an ether link valoneic acid dilactone while Kinjo and Shuaibu et al.[6] called the molecule with a carbon-carbon link flavogallonic acid dilactone.