The present invention relates to a compound represented by the formula (I), an inhibitor of a retinoid metabolic pathway containing the compound, an agent for increasing the proportion of memory T cells, a preventive and / or therapeutic agent for cancer or infectious disease, cancer immunity Methods of generating T cell populations with increased proportion of memory T cells using therapeutic adjuvants, immunity enhancing agents, and compounds of formula (I) are provided.本発明は、式（Ｉ）で示される化合物、それを含むレチノイド代謝経路の阻害剤、メモリーＴ細胞の割合を増大させるための剤、癌または感染症の予防および／または治療剤、癌の免疫療法の補助剤、免疫力増強剤、ならびに式（Ｉ）の化合物を用いるメモリーＴ細胞の割合が増大したＴ細胞集団の作成方法を提供する。
