| abstract |
The invention provides PDE9-inhibiting compounds of Formula (I), n n n n n n n n n n and pharmaceutically acceptable salts thereof, wherein R 1 , R 2 , R 3 , A, and n are as defined herein. Pharmaceutical compositions containing the compounds of Formula I, and uses thereof in treating neurodegenerative and cognitive disorders, such as Alzheimer's disease and schizophrenia, are also provided. |