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Dianhydrohexitols are heterocyclic compounds that are obtained by double dehydration of hexitols such as mannitol and sorbitol. Among these diols the 1,4- and 3,6-dianhydrohexitols are well known under the names isosorbide, isoidide and isomannide.
References
Dianhydrohexitol Wikipedia(Text) CC BY-SA