- 93 - ABSTRACTCompounds represented by general formula (I) (all of the symbols in the formula conform to the definitions in 5 the Description) are compounds that, in addition to having a Btk-selective inhibitory activity, exhibit an excellent metabolic stability and can avoidhepatotoxicity or the like, and as a consequence can provide safe therapeutic agents for diseases in which B 10 cells or mast cells participate.