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casuarinin
Casuarinin is an ellagitannin. It is found in the pericarp of pomegranates (''Punica granatum''). It is also found in ''Casuarina'' and ''Stachyurus'' species and in ''Alnus sieboldiana''.〔Structures of alnusiin and bicornin, new hydrolyzable tannins having a monolactonized tergalloyl group. Yoshida T, Yazaki K, Memon M.U, Maruyama I, Kurokawa K, Shingu T and Okuda T, Chemical and pharmaceutical bulletin, 1989, volume 37, number 10, pages 2655-2660, ((abstract ))〕
It is an isomer of casuarictin. It is a highly active carbonic anhydrase inhibitors.
== Biosynthesis ==
In some plants including oak and chestnut, the ellagitannins are formed from 1,2,3,4,6-pentagalloyl-glucose and further elaborated via oxidative dehydrogenation (tellimagrandin II and casuarictin formations). After conversion of casuarictin to pedunculagin, the pyranose ring of the glucose opens and the family of compounds including casuariin, casuarinin, castalagin, and castlin, vescalagin and vescalin forms.〔(Tannins chemistry by Hagerman A. E. )〕
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