英文别名Afatinib impurity 3; (2E)-N-{4-[(3-Chloro-4-fluorophenyl)amino]-7-[(3R)-tetrahydro-3-furanyloxy]-6-quinazolinyl}-4-(dimethylamino)-2-butenamide; (2E)-N-[4-[(3-Chloro-4-fluorophenyl)amino]-7-[[(3R)-tetrahydro-3-furanyl]oxy]-6-quinazolinyl]-4-(dimethylamino)-2-butenamide