The invention concerns quinazoline derivatives of formula wherein n is 1, 2 or 3 and each R.sup.2 is independently halogeno; and R.sup.1 is 1-4C)alkoxy-(2-4C)alkylamino; or pharmaceutically-acceptable salts thereof; processes for their preparation, pharmaceutical compositions containing them, and the use of the receptor tyrosine kinase inhibitory properties of the compounds in the treatment of proliferative disease such as cancer.