| 摘要 |
Compounds represented by general formula (I) or salts thereof, a process for producing the same, and intermediates therefor, wherein R represents hydroge n or methyl; R1 represents hydrogen, halogeno, hydroxy, benzyloxy, amino, or hydroxymethyl; R2 represents hydrogen, hydroxymethyl, NHR3, SO2NR4R4, or nitro; R6 represents hydrogen or lower alkyl; and X represents nitrogen, oxygen, sulfur, or methylene, provided that when X represents nitrogen, oxygen, or sulfur, then R9 represents hydrogen, one of R7 and R8 represents hydrogen, and the other thereof represents hydrogen, amino, acetylamino, or hydroxy, and when X represents methylene, then R7 and R8 each represents hydrogen and R9 represents hydrogen, amino, etc. They have a .beta.-3 adrenaline receptor agonist and are useful as drugs for the treatment and prevention of diabetes, obesity, hyperlipemia, etc.
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