| abstract |
The present invention provides a benzofuran derivative of the formulae [1], wherein x is a group of the formula: -N= or -CH=; Y is an optionally substituted amino group, an optionally substituted cycloalkyl group or an optionally substituted saturated heterocyclic group; A is a single bond, a carbon chain optionally having a double bond within or at the end(s) of the chain, or an oxygen atom; R1 is a hydrogen atom or a halogen atom; ring B is an optionally substituted benzene ring; and R3 is a hydrogen atom, or a pharmaceutically acceptable salt thereof, which is useful as a medicament, especially as an activated blood coagulation factor X inhibitor. |