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The title compound, C12H23NO2·0.5H2O, crystallized with two 2-(1-amino-4-tert-butylcyclohexyl)acetic acid mol­ecules, which are present as zwitterions, and one water mol­ecule in the asymmetric unit. The mol­ecular structure of each zwitterion is stabilized by an intra­molecular six-membered (C6 ) N—H...O hydrogen bond. In the crystal, the two independent zwitterions are linked head-to-head by N—H...O hydrogen bonds. Further O—H...O and N—H...O hydrogen bonds link the zwitterions and the water molecules, forming sandwich-like layers, with a hydrophilic filling and a hydrophobic exterior, lying parallel to the ab plane.

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In the title compound, C20H13ClO3, the dihedral angles between the benzoate and the chloro­benzene and benzoyl rings are 68.82 (5) and 53.76 (6)°, respectively, while the dihedral angle between the benzoyl and benzoate rings is 81.17 (5)°. The eight atoms of the benzoyl residue are essentially planar with the exception of the O atom which lies 0.1860 (5) Å out of their mean plane (r.m.s. deviation = 0.97 Å). The nine atoms of benzoate residue are also essentially planar (r.m.s. deviation = 0.20 Å) with the ester O atom showing the greatest deviation [0.407 (12) Å] from their mean plane. In the crystal, mol­ecules are connected into centrosymmetric dimers by pairs of C—H...O hydrogen bonds.
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