| abstract |
The present invention provides a benzofuran derivative useful as a medicament, in particular, an activated blood coagulation factor X inhibitor. The general formula [1]: Embedded image (Wherein X represents a group represented by the formula: -N = or the formula: -CH =. Y represents an optionally substituted amino group, an optionally substituted cycloalkyl group, or an optionally substituted A represents a single bond, a carbon chain or an oxygen atom which may have a double bond in the chain or at the chain end, and R 1 represents a hydrogen atom, a halogen atom or the like. .formula: Embedded image Ring B represented by represents a benzene ring which may be substituted. R 3 represents a hydrogen atom or the like. Or a pharmaceutically acceptable salt thereof. |