The present invention addresses the problem of providing a compound for prophylaxis and/or treatment of inflammatory diseases of the central nervous system, or a pharmacologically acceptable salt thereof. Provided is a compound represented by general formula (1) or a pharmacologically acceptable salt thereof. [R1: a C1-C6 alkyl group or the like, R2: a C1-C6 alkyl group or the like, A: a five-membered aromatic hetero-ring or the like, R3, R3 ': a C1-C6 alkyl group or the like]
