4-(3-chloro-2-fluoroanilino)-7 methoxy-6-{[1-(N-methylcarbamoylmethyl)piperidin-4-yl]oxy}quinazolinedifumarate, pharmaceutical compositions containing the difumarate, the use of the difumarate in the treatment of hyperproliferative disorders such as cancer and processes for the manufacture of the difumarate are described.