abstract |
Compounds of the formula I: n nor a pharmaceutically acceptable salt thereof, wherein, R 1 is a group of formula A or formula B,n n nand X, R 2 , R 3 , R 4 , R 5 , R 6 , R a and R b are as defined herein. Also provided are methods of using the compounds for treating diseases mediated by a P2X 3 and/or a P2X 2/3 receptor antagonist and methods of making the subject compounds. |