(S)-N1-(4-((3-Chloro-4-fluorophenyl)amino)-7-((tetrahydrofuran-3-yl)oxy)quinazolin-6-yl)-N2,N2-dimethyloxalamide (Afatinib Impurity）

(S)-N1-(4-((3-Chloro-4-fluorophenyl)amino)-7-((tetrahydrofuran-3-yl)oxy)quinazolin-6-yl)-N2,N2-dimethyloxalamide (Afatinib Impurity）