(S)-N-(4-((3-Chloro-4-fluorophenyl)amino)-7-((tetrahydrofuran-3-yl)oxy)quinazolin-6-yl)-4-hydroxybutanamide is an intermediate in the synthesis of Des-(4-dimethylamino-2-en-1-oxo)butylamino 6-(5-Hydroxy-pyrrolidin-2-on-1-yl) Afatinib which is a derivative compound of Afatinib (A355300) used for the treatment of breast cancer and other cell lunger cancer related diseases.