A compound of formula (I)
Or its salts or pharmaceutically acceptable derivatives thereof wherein;
A represents a chemical moiety with the general formula (II):
X is selected from a group consisting of CH
2
, C(═O), CH(R
5
), C(R
5
)(R
6
) or C(R
5
)(R
6
)CH
2
;
R
1
is selected from the group consisting of optionally substituted arylalkyl, and optionally substituted heteroarylalkyl;
R
2
is selected from the group consisting of optionally substituted aryl or optionally substituted heteroaryl or NR
7
R
8
;
R
3
R
4
R
5
R
6
R
7
and R
8
are as defined herein; and n=1 or 2 is provided. Pharmaceutical compositions comprising the compounds are also provided. The compounds are useful in treating various conditions including arrhythmia.