| 摘要 |
The present invention is to provide an aliphatic nitrogen-containing 5-membered ring compound represented by the formula [I]: wherein symbols in the formula have the following meanings; A: -CH<SUB>2</SUB>- or -S-, B: CH or N, R<SUP>1 </SUP>H, a lower alkyl group, etc., X: a single bonding arm, -CO-, -Alk-CO-, -COCH<SUB>2</SUB>-, -Alk-O-, -O-CH<SUB>2</SUB>-, -SO<SUB>2</SUB>-, -S-, -COO-, -CON(R<SUP>3</SUP>)-, -Alk-CON(R<SUP>3</SUP>)-, -CON(R<SUP>3</SUP>)CH<SUB>2</SUB>-, -NHCH<SUB>2</SUB>-, etc., R<SUP>3</SUP>: hydrogen atom or a lower alkyl group, Alk: a lower alkylene group,,and. R<SUP>2</SUP>: (1) a cyclic group which may be substituted, (2) a substituted amino group, etc., provided that when X is -CO-, then B is N, or a pharmaceutically acceptable salt thereof.
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