| 摘要 |
A compound of formula (I) and its pharmaceutically acceptable salts having selective dopamine D3 receptor activity suitable for treating central nervous system disorders. In formula (I) R1 is independently H or an alkyl including isomeric forms thereof; R2 is H, C1-C3 alkyl, a halogen, OCH3, OCF3, CF3, CN, SCH3 or NHCOCH3; and R3 is H, C1-C3 alkyl, a halogen, OCH3, OCF3, CF3, CN, SCH3 or NHCOCH3.
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