| abstract |
The present invention relates to compounds of formula (I), or a pharmaceutically acceptable salt thereof; A method for producing the same; Intermediates used in its manufacture; A composition containing the compound or salt; And cognitive impairment (e.g., cognitive impairment associated with cognitive impairment, AD or PD), and D3-mediated (or D3-associated) disorders such as substance abuse, substance abuse, Parkinson's disease, craving, anxiety, impulse control disorders, sexual disorders and depression: In this formula, R 1 , R 2 , R 3 , R 4 , R 5 , a and A are as defined herein. |