| abstract |
The present invention discloses a quinazoline derivative or a salt thereof shown in formula (I) having PDE9 inhibitory effect and useful as a therapeutic drug for urination disorders, etc., wherein, R 1 represents that it can be selected from a halogen atom, C 1-6 alkyl, C 1-6 haloalkyl containing 1-6 halogen atoms and phenyl or aromatic heterocyclic group substituted by 1-3 substituents of C 1-6 alkoxy; n is 1-6 Integer of 3. |