A compound of formula (I) or a pharmaceutically acceptable salt thereof and a pharmaceutical composition comprising said compound. Since the compound is an inhibitor of the interaction between S100A9 and interaction partners such as RAGE, TLR4 and EMMPRIN, it is useful for the treatment of diseases such as cancer, autoimmune diseases, inflammatory diseases and neurodegenerative diseases. Useful. [Selection figure] None式(I)の化合物又はその薬学的に許容可能な塩、及び該化合物を含む医薬組成物。当該化合物は、S100A9と、RAGE、TLR4及びEMMPRINなどの相互作用パートナーとの間の相互作用の阻害薬であるので、がん、自己免疫疾患、炎症性疾患及び神経変性疾患などの疾患の治療に有用である。【選択図】なし