| abstract |
Disclosed is a tetracyclic compound represented by formula (I), a pharmaceutically acceptable salt thereof, or the like. (In the formula (I), formula (A) represents a benzene ring or the like; X represents CH or a nitrogen atom; Q represents -O- or the like; R 1 , R 2 and R 3 may be the same or different and each represents a hydrogen atom or the like; l, m and n each represents an integer from 1 to the maximum number of substitutable positions; and R 4 and R 5 may be the same or different and each represents a hydrogen atom or the like.) |