Ellagitannins extracted from the pericarps of Punica granatum, the pomegranate, such as punicalin, punicalagin, granatin B, gallagyldilactone, casuarinin, pedunculagin and tellimagrandin I, are highly active carbonic anhydrase inhibitors.
Valoneic acid dilactone, flavogallonic acid dilactone, gallagyldilactone, ellagic acid and gallic acid are hydrolysable tannins that can be isolated from the heartwood of S.