| 摘要 |
A tetracyclic compound of formula (I) wherein A and the atoms to which it is attached and the optional double bond represent a mono- or di-heterocyclic ring selected from formulas (a), (b), (c), (d) and (e) wherein R<1>, R<2>, R<3>, R<4> and X are specifically defined, which compounds are useful in the treatment of dopamine-related neurological, psychological and cardiovascular disorders as well as in the treatment of substance abuse and other addictive behavior disorders, cognitive impairment and attention deficit disorder. |
