The present invention contains, as an active ingredient, a compound represented by the general formula (1): [wherein each symbol is as defined in the specification], or a salt thereof, or a solvate thereof. An agent for preventing and / or treating inflammatory diseases such as inflammatory bowel diseases and inflammatory diseases such as vasculitis is provided.本発明は、一般式(1):[式中、各記号の定義は明細書中に記載の通りである]で表される化合物、若しくはその塩、又はそれらの溶媒和物を有効成分として含有してなる炎症性疾患、特に炎症性腸疾患及び血管炎等の炎症性疾患の予防及び/又は治療剤を提供する。