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VERY little is known about the constitution of the complexes formed by the combination of polyhydric alcohols and sugars with boric acid or borax. Mannitoboric acid, for instance, is held to be produced by the condensation of two hydroxyl groups of one mannitol molecule with one molecule of boric acid, forming a ring containing two atoms of oxygen. Whether the reacting hydroxyl groups are adjacent or not is a question that has yet to be satisfactorily settled. Boeseken has stated (Rec. truv.doi:10.1039/ct9222101333 fatcat:yamaz3225jdonfom5u7ccjy24i