title: 2-Methyl-1,10b-dihydro-5H-pyrazolo[1,5-c][1,3]benzoxazin-5-one.
abstract: In the title compound, C(11)H(10)N(2)O(2), a potential inhibitor of the cyclo-oxygenase-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 mol-ecule 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.
authors.affiliation: Faculty of Pharmacy, Comenius University, Odbojarov 10, SK-83232 Bratislava, Slovakia.
authors.forename: Viktor
authors.initials: V
authors.lastname: Kettmann
authors.forename: Jan
authors.initials: J
authors.lastname: Světlík