| abstract |
Formula [I] [Where: Ring A represents an optionally substituted 5-membered aromatic heterocyclic group to which a non-aromatic cyclic group is fused, and the like. Ring B represents an optionally substituted phenyl group or the like, X 1 represents a single bond or the like, R 1 and R 2 represent a C1-6 alkyl group or the like, m represents an integer of 0 to 3, n represents an integer of 0 to 2], or a pharmacologically acceptable salt or ester is effective as a therapeutic agent for diseases caused by Aβ. |