| abstract |
The present invention provides compounds represented by the formula:n nor a salt thereof, wherein, each A 1a and A 3a are the same as or different from each other and each indicates an optionally substituted C 6-14 aromatic hydrocarbocyclic group or 5 to 14-membered aromatic heterocyclic group; and W represents a halogen atom. The compounds are intermediates for the preparation of inhibitors of the AMPA receptor. |