The new title compound 8-((4-((2,3-diaminopyridin-4-yl)-oxy)-3-fluorophenyl)amino)-2-(4-fluorophenyl)-3-methyl-2,7-naphthyridin-1(2H)-one (C_(26)H_(20)F_2N_6O_2, Mr = 486.48) has been prepared and determined by single-crystal X-ray diffraction. The crystal is of monoclinic, space group P2_1/c with a = 15.365(3), b = 13.144(2), c = 11.863(2) A, β= 108.882(3)°, Z = 4, V = 2267.0(7) A~3, Dc = 1.425 g/cm~3, F(000) = 1008, μ = 0.105 mm~(-1), MoKa radiation （λ = 0.71073 A），R = 0.0480 and wR = 0.1294 for 3197 observed reflections with I> 2σ(I)...
