5,5'-bis(2-(4-(benzo[d]isothiazol-3-yl)piperazin-1-yl)ethyl)-6,6'-dichloro-3-hydroxy-[3,3'-biindoline]-2,2'-dione;5,5?-Bis[2-[4-(1,2-benzisothiazol-3-yl)-1-piperazinyl]ethyl]-6,6?-dichloro-1,1?,3,3?-tetrahydro-3-hydroxy-[3,3?-bi-2H-indole]-2,2?-dione;5,5?-Bis{2-[4-(benzo[d]isothiazol-3-yl)piperazin-1-yl]ethyl}-6,6?-dichloro-3-hydroxy-3,3?-biindoline-2,2?-dione;Ziprasidone EP Impurity D