abstract |
The present invention relates to a compound represented by formula (I) or a salt thereof, wherein R 1 is a group represented by the formula wherein R 2 , R 3 , R 4 , R 5 , R 6 , R 7 and R 8 are each independently a hydrogen atom Or C 6-1 alkyl. The compounds of the present invention are useful as drugs for the prevention or treatment of circulatory diseases such as hypertension and the like and metabolic diseases such as diabetes and the like. or |