abstract |
The present invention is related to a compound represented by formula (I), n n n n n n n n n n n n wherein X 1 , X 2 , X 3 , X 4 , X 5 , R 5 , R 6 , R 7 , R 8 , n, p, q, ring A and ring B are as described in the specification, or a pharmaceutically acceptable salt thereof. |