| 摘要 |
Compounds of Formula I: (I) wherein X, Y, Z, R 1, R 2, R 3, R 4 are as defined herein, and pharmaceutically acceptable salts thereof, are described as useful for the treatment of cognitive 5 deficits associated with schizophrenia and other psychiatric, neurodegenerative and/or neurological disorders in mammals, including humans. |
