An antiarrhythmic agent of the formula
or a pharmaceutically acceptable salt thereof; wherein
R1 is H, C1-C4 alkyl or Ci-C4 alkoxy; X is O,
or a direct link; and
R2 and R3, which are the same or different, are each C1-C4 alkyl, with the proviso that when X is
and R3 are the same.
式中的抗心律失常剂
或其药学上可接受的盐;其中
R1 是 H、C1-C4 烷基或 Ci-C4 烷氧基; X 是 O
或直接连接;以及
R2和R3(相同或不同)各自为C1-C4烷基,但当X是
和 R3 相同时。