A compound of formula (I), or a pharmaceutically acceptable salt thereof:
The compound is used in pharmaceutical compositions and in a method of treatment of a disease or medical condition which benefits from inhibition of gap junction activity by administering to a subject suffering from such disease or condition.
A compound of formula (I), or a pharmaceutically acceptable salt thereof: wherein Z
1
, Z
2
, and Z
3
, Q, R
2
, A, and R
1
are as defined in the claims.