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The preparation, single-crystal X-ray structure and solution-state NMR analysis of (±)-threo-ritalinic acid, obtained from the hydrolysis of the methyl ester (±)-threo-methyl phenidate, are reported.

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The title compounds consist of a 1,7,7-tri­methylbi­cyclo­[2.2.1]heptane (bornane or camphane) skeleton which is decorated with acetamide for (±)-(1) and chloro­acetamide for (±)-(2), functionalities. In the crystals of both compounds, mol­ecules are linked via N—H...O hydrogen bonds, reinforced by C—H...O contacts, forming chains propagating along the a axis.

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An error in the structure-factor expression for space group P6222 (No. 180) has been found in International Tables for X-ray Crystallography, Volume I, 1st through 3rd editions. The minus sign of the second sine function in the B part of the equation for l = 3n ± 1 should be a plus sign.

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The crystal structure of hydrated (±)-mefloquine hydrochloride is determined by an ab initio algorithm (simulated annealing) using X-ray powder diffraction data and confirmed by a combination of theoretical calculations and Fourier transform–infrared spectroscopy.

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The structures of the isostructural sodium, potassium, and ammonium double salts of [Co(en)3]Cl3 (en is ethane-1,2-di­amine) have been determined and, com­pared with the parent com­pound, show a modest increase in the unit-cell volume.

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The structure, coordination geometry and extended hydrogen-bonded network of tris­(ethane-1,2-di­amine-κ2N,N′)cobalt(III) bis­(iodide) triiodide is discussed.

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The crystal structure of the C-terminal domain of the plant-specific microtubule minus-end-targeting protein Spiral2 was determined to 2.2 Å resolution. The structure is shown to be similar to the C-terminal domain of the katanin regulatory subunit p80.

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The first structure with coordinates of tris­(trans-1,2-di­amino­cyclo­hexa­ne)cobalt(III) chloride monohydrate in the space group I\overline{4}2d is reported.

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