| 摘要 |
The object of the present invention is to provide a potassium channel opener having benzofuroindole skeleton representing the following formula (I) wherein, R<SUB>1 </SUB>is hydrogen, R<SUB>2 </SUB>is CF<SUB>3</SUB>, R<SUB>3 </SUB>is COOH, R<SUB>4 </SUB>is hydrogen, R<SUB>5 </SUB>is hydrogen or chloride and R<SUB>6 </SUB>is hydrogen or chloride.
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