Patent ID: 8492378

Claim:
A GSK-3β inhibitor comprising a compound represented by the formula (I): wherein R 1 is a group represented by the formula: R 1a —Y— wherein Y is a bond, a sulfur atom, or —NR y — (R y is a hydrogen atom, or a lower alkyl group), and R 1a is (1) a hydrogen atom, or (2) a C 1-2 alkyl group optionally substituted by one or more substituents selected from the group consisting of a halogen atom, an optionally substituted carbamoyl group, an optionally substituted C 6-10 aryl group and an optionally substituted 5- to 10-membered aromatic heterocyclic group, and W is a group represented by the formula: wherein ring A is a 6-membered aromatic ring, X is an oxygen atom, and ring B is a 5-membered heterocycle represented by wherein Rb is an optionally substituted phenyl group, or an optionally substituted 5- or 6-membered heterocyclic group, and Rb′ is a hydrogen atom, an amino group, or a monosubstituted amino group, or a salt thereof.