The present invention encompasses compounds of general formula (I) wherein the groups R1 to R3 have the meanings given in the claims and in the specification. The compounds of the invention are suitable for the treatment of diseases characterized by excessive or abnormal cell proliferation pharmaceutical preparations containing such compounds and their uses as a medicament.本發明涵蓋通式(I)之化合物,其中基團R1至R3具有申請專利範圍及說明書中給定之含義。本發明之該等化合物適於治療特徵為過度或異常細胞增殖之疾病,含有該等化合物之醫藥製劑,及其作為藥劑之用途。
