has role tertiary alcohol organofluorine compound serotonergic antagonist dopaminergic antagonist hydroxypiperidine antiemetic haloperidol A compound composed of a central piperidine structure with hydroxy and <em>p</em>-chlorophenyl substituents at position 4 and an <em>N</em>-linked <em>p</em>-fluorobutyrophenone moiety. first generation antipsychotic antidyskinesia agent aromatic ketone monochlorobenzenes