3-(4-Fluoro-phen-yl)-6-meth-oxy-2-(4-pyrid-yl)quinoxaline.

In the title compound, C(20)H(14)FN(3)O, the quinoxaline system makes dihedral angles of 32.38 (7) and 48.04 (7)° with the 4-fluoro-phenyl and pyridine rings, respectively. The 4-fluoro-phenyl ring makes a dihedral angle of 57.77 (9)° with the pyridine ring. In the crystal, the mol-ecules form dimeric C-H⋯N hydrogen-bonded R(2) (2)(20) ring motifs lying about crystallographic inversion centers. The dimeric units stack via π-π inter-actions between methoxy-phenyl rings and pyridine-fluoro-phenyl rings with centroid-centroid distances of 3.720 (1) and 3.823 (1) Å, respectively. The respective average perpendicular distances are 3.421 and 3.378 Å, with dihedral angles between the rings of 1.31 (9) and 11.64 (9)°.