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