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The relative configuration of the stereocentres in a potential hexosaminidase inhibitor, C14H20N2O3, prepared from D-lyxonolactone, has been established using X-ray crystallographic techniques.

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The solid-state conformation of the title compound, C14H20N2O3·0.33H2O, a potent hexosaminidase inhibitor, prepared from D-lyxonolactone, has been established by X-ray crystallography. The asymmetric unit contains three mol­ecules, which have very similar conformations, together with a mol­ecule of water.

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The crystal structure of diacetone tagatose, C12H20O6, establishes the stereochemistry of the anomeric spiro­acetal as 1,2:3,4-di-O-isopropyl­idene-α-D-tagatofuran­ose. Mol­ecules are linked by O—H...O hydrogen bonds [O...O = 2.862 (2) Å] to form chains running parallel to the b axis.

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The crystal structure of the title diacetone psicose, C12H20O6, establishes the stereochemistry of the anomeric spiro­acetal 1,2:3,4-di-O-isopropyl­idene-β-D-psicofuran­ose. The structure consists of columns of mol­ecules linked by hydrogen bonds into chains [O...O 2.962 (2) Å] lying parallel to the a axis.
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