摘要 |
This invention relates to benzopyran derivatives of the formula (1) or the formula (2) wherein R<SUP>1 </SUP>and R<SUP>2 </SUP>represent independently of each other hydrogen atom or C<SUB>1-6</SUB>alkyl group, R<SUP>3 </SUP>represents hydroxyl group or C<SUB>1-6 </SUB>alkylcarbonyloxy group, R<SUP>4 </SUP>represents hydrogen atom or C<SUB>1-6 </SUB>alkyl group, R<SUP>5 </SUP>represents C<SUB>1-6 </SUB>alkyl group substituted with C<SUB>6-14 </SUB>aryl group or heteroaryl group, R<SUP>6 </SUP>represents C<SUB>1-6 </SUB>alkyl group, C<SUB>1-6 </SUB>alkoxy group, halogen atom, nitro group, C(O)NH<SUB>2</SUB>, C(O)NHR<SUP>8 </SUP>or C(O)NR<SUP>8</SUP>R<SUP>9</SUP>, or pharmaceutically acceptable salts thereof. These compounds are useful as an antiarrhythmic agent |