Acta Cryst. (2008). E64, o563  [ doi:10.1107/S1600536808003607 ]

4-[(5R*,10bR*)-2-Methyl-1,10b-dihydropyrazolo[1,5-c][1,3]benzoxazin-5-yl]benzoic acid

V. Kettmann and J. Svetlík

Abstract: In the title compound, C₁₈H₁₆N₂O₃, a potential inhibitor of the cyclooxygenase-2 isoenzyme, the pyrazoline ring exists in a flattened envelope conformation with one C atom deviating by 0.463 Å from the mean plane of the remaining four atoms. The puckering of the central oxazine ring is more severe, with one N atom and one C atom displaced by 0.235 (6) and 0.370 (2) Å, respectively, on opposite sides of the mean plane defined by the other four atoms; the conformation is that of a half-chair. As a result, the molecule as a whole is not planar. The carboxyl group is involved in an intermolecular O-HN hydrogen bond, which links the molecules into centrosymmetric dimers.

Online 6 February 2008

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