C14Ht0F3NO2, P2.Jc, a = 12.523 (4), b =
7.868(6), c = 12.874 (3)A, fl = 95.2 (2) ° , O,,, =
1.47 (4), D e = 1.47 Mg m -3, Z = 4. Final R = 0.074
for 2255 observed reflections. The carboxyl group and
the phenyl ring bearing the carboxyl group are nearly
coplanar whereas the two phenyl rings are inclined with
respect to each other at 52.8 ° . The difference between
the two polymorphs of flufenamic acid lies in the
geometrical disposition of the [3-(trifluoromethyl)-
phenyl]amino moiety with respect to the benzoic acid
moiety. As in other fenamate structures, the carboxyl
group and the imino N atom are connected through an
intramolecular hydrogen bond; also, pairs of centrosymmetrically related molecules are connected through
hydrogen bonds involving carboxyl groups