TRICYCLIC COMPOUND

摘要

A heteroatom-containing compound having excellent activity when used as an a2d ligand. The compound is a compound having general formula (I) or a pharmacologically acceptable salt thereof. [In formula (I), the substituents are defined as shown below: R1 is a hydrogen atom, etc.; R2 is a C1-6 alkyl, etc.; R3 is a hydrogen atom, etc.; R4 is a hydrogen atom, etc.; and m and n each is 0, 1, or 2.]