The monohydrate of 5-(2-(4-(1,2-benzisothiazol-3-yl)-1-piperazinyl)ethyl)-6-chloro-1,3-dihydro-2H-indol-2-one hydrochloride has advantageous stability for formulation as a neuroleptic agent.
MONOHYDRATE OF 5-(2-(4-(1,2 BENZISOTHIAZOL-3-YL)-1- PIPERAZINYL)-ETHYL)-6-CHLORO-1,3-DIHYDRO-2H-INDOL-2-ONE HYDROCHLORIDE