| 摘要 |
The invention relates to compounds of formula (I): wherein R1 and R2 together form the following carbon-containing chain: wherein: R3 represents a hydrogen atom or an alkyl group, R4 represents a hydrogen atom or an alkyl, aryl, heteroaryl, 3,4-dioxocyclobutenyl, alkylcarbonyl, cycloalkylcarbonyl, heterocycloalkylcarbonyl, benzoyl, arylsulphonyl or heteroarylsulphonyl group, each of those groups optionally being substituted, or R3 and R4 together with the nitrogen atom carrying them form a 5- to 8-membered ring, the ring thereby formed optionally being substituted. Medicinal products containing the same which are useful in treating conditions requiring a D3 receptor antagonist.
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