Abstract
In the title compound, C11H10N2O2, a potential inhibitor of the cyclooxygenase-2 isoenzyme, the pyrazoline ring exists in a flat-envelope conformation while the puckering of the central oxazine ring is more severe. As a result, the molecule as a whole is non-planar. The formal sp 3 pyrazoline N atom is sp 2 hybridized, with the lone-pair electrons delocalized through conjugation with the carbonyl group rather than the double bond of the pyrazoline ring.
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