This invention relates to benzopyran derivatives of the formula (1) or the formula
(2) wherein R1 and R2 represent independently of each other
hydrogen atom or C1-6alkyl group, R3 represents hydroxyl
group or C1-6 alkylcarbonyloxy group, R4 represents hydrogen
atom or C1-6 alkyl group, R5 represents C1-6 alkyl
group substituted with C6-14 aryl group or heteroaryl group, R6
represents C1-6 alkyl group, C1-6 alkoxy group, halogen
atom, nitro group, C(O)NH2, C(O)NHR8 or C(O)NR8R9,
or pharmaceutically acceptable salts thereof. These compounds are useful as an
antiarrhythmic agent
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