| abstract |
(57) [Problem] To provide a novel cyclic compound having a pharmacological property to a melatonin receptor. The present invention relates to a compound of formula (I): [Wherein R represents an OR a , SR a or R a group, or a cyclic group, A represents a cyclic structure, and G 1 and G 2 represents an alkylene chain or a single bond, and B represents —NR 1. a C (Q) R 2 a , —NR 1 a C (Q) NR 2 a R 3 a or — Represents a C (Q) NR 1 a R 2 a group, p and q are 1 ≦ p + It is such that q ≦ 4]. |