Disclosed are compounds of the formula: where S and V are various organic or inorganic substituents; G and K are the same or different and represent N or CR′ where R′ is an organic or inorganic substituent; R is hydrogen or an alkyl group; R1, X, Y, Z and T are organic or inorganic substituents; and R2 and R3 represent hydrogen or organic substituents; or NR2R3 together represents a heterocyclic ring system; and the pharmaceutically acceptable salts thereof; which are highly selective partial agonists or antagonists at brain dopamine receptor subtypes and, thus, are useful in the diagnosis and treatment of affective disorders such as schizophrenia and depression as well as certain movement disorders such as Parkinsonism.