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In the the title compound, C6H11N2O4P, the P atom and the attached H atom lie on a crystallographic twofold axis. The mol­ecule adopts a slightly distorted trigonal bipyramidal structure. The crystal structure involves intermolecular N—H...O hydrogen bonds.

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The title compound, C13H17NO4, has been obtained as an unexpected product when attempting to prepare diethyl (S)-2-(2-methoxy­carbonyl­amino-3-phenyl­propionyl)­malonate. The crystal structure involves intermolecular N—H...O hydrogen bonds.

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In the crystal structure, the title compound, C15H17N2O4P, exists as a centrosymmetric dimer containing N—H...O=P hydrogen bonds. The amino N atom interacts with the doubly bonded phospho­ryl O atom.

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The title compound, C16H16O4, has been obtained by the reaction of O-benzyl­ated L-tyrosine with sodium nitrite as colorless blocks. The packing of the title compound exhibits two independent hydrogen bonds involving the hydr­oxy and carboxylic groups, giving rise to an infinite ladder parallel to the b axis.

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The title compound, C18H23NO3, has been obtained by the reaction of (1S,4R)-7,7-dimethyl-2-oxobicyclo­[2.2.1]heptane-1-carbonyl chloride with (S)-2-amino-3-phenyl­propan-1-ol. The carbonyl functionality of the carboxamide group and the hydr­oxy group are involved in O—H...O inter­molecular hydrogen bonds.

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Colorless crystals of the title compound, C16H17NO2, have been obtained by the reaction of benzoyl chloride and (S)-2-amino-3-phenyl­propan-1-ol. The crystal packing is stabilized by O—H...O and N—H...O inter­molecular hydrogen-bonding inter­actions.

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The title compound, C11H17NO2, was obtained by hydrogeno­lysis of (3S,4S)-4-(dibenzyl­amino)-5-phenyl­pentane-1,3-diol. In the crystal structure, inter­molecular O—H...O, O—H...N and N—H...O hydrogen bonds link the mol­ecules into a sheet parallel to the ab plane.
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