Acta Cryst. (2013). E69, o1107 [ doi:10.1107/S1600536813016036 ]
Abstract: In the title compound, C27H27NO5 (systematic name: 17-cyclopropylmethyl-14-hydroxy-6-oxo-4,5-epoxymorphinan-6-yl benzoate), which is the benzoate ester of the opioid receptor antagonist naltrexone, the dihedral angle between the two phenyl rings is 77.1 (1)°. In the crystal, a weak aromatic C-HOcarboxyl hydrogen bond involving the benzoate groups of adjacent molecules gives rise to a chain extending along the a-axis direction. The known absolute configuration for the molecule was inferred from a previous naltrexone structure.
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