There is provided a compound of formula(I):or a pharmaceutically acceptable salt thereof. There are also provided processes for the manufacture of a compound of Formula 1, and the use of a compound of Formula 1 as a medicament and in the treatment of cnncer.本發明係提供式(I)化合物:或其藥學上可接受之鹽。亦提供製造式1化合物之方法,及式1化合物作為藥劑與在癌症治療上之用途。