The compound of the bright offer formula (I) of this Hair and its Drug Yong Which , Qi System Prepare method, the Drug Wu Group containing it close object and its are controlling the purposes in Treatment, and wherein R1 and R2 Dings Righteousness as illustrated Books Zhong Suo.本發明提供式(I)的化合物及其藥用鹽,其製備方法,含有其的藥物組合物及其在治療中的用途,其中R1和R2如說明書中所定義。