A compound of formula (I):
wherein all symbols have the same meanings as defined in the specification; a salt thereof, a solvate thereof, an N-oxide thereof, or a prodrug thereof, has an Itk inhibitory activity, and is useful as a method for preventing and/or treating atopic dermatitis, and the like.
式(I)的化合物:其中所有符号的含义与说明书中定义的含义相同;其盐,溶剂化合物,N-
氧化物或前药,具有Itk抑制活性,并且可用于预防和/或治疗特应性皮炎等疾病的方法。