The specification relates to compounds of Formula (I): and to pharmaceutically acceptable salts thereof, to processes and intermediates used for their preparation, to pharmaceutical compositions containing them and to their use in the treatment of cell proliferative disorders.本說明書係關於式(I)化合物: 及其醫藥學上可接受之鹽,係關於用於其製備之方法及中間物、含有其之醫藥組合物及其在細胞增生性病症治療中之用途。