Afatinib iMpurity 4-Hydroxy 4-Dedimethylamino Afatinib Afatinib Impurity 9 Afatinib Impurity 6 Afatinib IMpurity E Afatinib Impurity 17 Afatinib Impurity 4 Afatinib Impurity 14 Afatinib Impurity 2 Afatinib Impurity 15 N-(3-chloro-4-fluorophenyl)-7-Methoxy-6-nitroquinazolin-4-aMine Afatinib Impurity 10 Afatinib R-afatinib Afatinib IMpurity F Afatinib Impurity 7 Afatinib Impurity 19 Afatinib Impurity 3