(E)-N-(4-((3-chloro-4-fluorophenyl)(4-((4-((3-chloro-4-fluorophenyl)amino)-7-(((S)-tetrahydrofuran-3-yl)oxy)quinazolin-6-yl)amino)-1-(dimethylamino)-4-oxobutan-2-yl)amino)-7-(((S)-tetrahydrofuran-3-yl)oxy)quinazolin-6-yl)-4-(dimethylamino)but-2-enamide