has role ziprasidone A piperazine compound having 1,2-benzothiazol-3-yl- and 2-(6-chloro-1,3-dihydro-2-oxindol-5-yl)ethyl substituents attached to the nitrogen atoms. indolones piperazines antipsychotic agent organochlorine compound histamine antagonist serotonergic antagonist dopaminergic antagonist muscarinic antagonist 1,2-benzisothiazole