The treatment of diseases characterized by excessive or abnormal cell proliferation suitable following formula invention, (1) (Wherein, X and R 1 ~R 3 are defined as in claim 1) including its use for the preparation of a medicament having the above properties and a compound of. None [Selection Figure]本発明は、過剰又は異常な細胞増殖を特徴とする疾患の治療に好適な下記一般式(1)(式中、R1~R3及びXは、請求項1の定義どおり)の化合物、及び上記特性を有する薬物を調製するためのその使用を包含する。【選択図】なし