As for this invention, the general expression which is suitable for the remedy of the disease which features excessive or abnormal cell breeding (1)< Conversion 1 >The use where (in formula, the basis1 R -3 R,1 X2, X3, X1 and L is and according to definition of claim 1) new chemical compound, and in its said remedying it regards.< Choice figure >It is not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適している一般式(1)【化1】(式中、基R1~R3、X1、X2、X3及びL1は、請求項1の定義どおりである)の新規化合物、及びその該治療における使用に関する。【選択図】なし