in displacement experiments butyrophenones ( haloperidol and spiroperidol ) and diphenylbutylpiperidines ( pimozide ) interact with d-2 receptors only , whereas thioxanthenes ( cis [ z ] -flupenthixol , cis [ z ] -piflutixol and cis [ z ] -clopenthixol ) have equal affinity for d-1 and d-2 receptors .
C0006525
butyrophenones
C0037956
spiroperidol