The present invention encompasses compounds of general formula (I)wherein the groups R1 to R3 and X are defined as in claim 1, which are suitable for the treatment of diseases characterised by excessive or abnormal cell proliferation, pharmaceutical preparations which contain such compounds and their use as medicaments.本發明涵蓋通式(I)化合物其中基團R1至R3及X如請求項1所定義，其適於治療特徵為過量或異常細胞增殖的疾病，含有該等化合物之醫藥製劑及其用作藥物之用途。
