INDUSTRIAL APPLICABILITY The present invention is useful as a novel antitumor agent targeting CSC, which is suggested to be importantly involved in the continuous growth of malignant tumors, cancer metastasis, recurrence, and resistance to antitumor agents, which is useful as a novel antitumor agent. And a pharmaceutically acceptable salt thereof. [In the formula, R1A, R1B, R1C and R1D are hydrogen atoms and the like, R2A and R2B are hydrogen atoms and the like, R3A, R3B, R3C and R3D are hydrogen atoms and the like, L represents a bond and the like, V Represents C1-6 alkylene, and Q represents an optionally substituted imidazole]本発明は、悪性腫瘍の持続的増殖、がんの転移、再発及び抗腫瘍剤への耐性に重要な関与が示唆されるＣＳＣを標的とする、新規抗腫瘍剤として有用な、式（Ｉ）で表される化合物またはその製薬学的に許容される塩に関する。［式中、Ｒ１Ａ、Ｒ１Ｂ、Ｒ１Ｃ及びＲ１Ｄは水素原子などであり、Ｒ２Ａ及びＲ２Ｂは水素原子などであり、Ｒ３Ａ、Ｒ３Ｂ、Ｒ３Ｃ及びＲ３Ｄは水素原子などであり、Ｌは結合などを表し、ＶはＣ１－６アルキレンを表し、Ｑは置換されていてもよいイミダゾールを表す］
