Patent ID: 7381726

Claim:
A process for preparing 1-[4-(5-cyanoindol-3-yl)butyl]-4-(2-carbamoyl-benzofuran-5-yl)-piperazine hydrochloride anhydrate in its crystalline modification IV, having characteristic x-ray diffraction peaks at 6,102, 5,246, 4,695, and 3,615 d(Å), comprising: drying Form V of 1-[4-(5-cyanoindol-3-yl)butyl]-4-(2-carbamoyl-benzofuran-5-yl)-piperazine hydrochloride monohydrate, having characteristic x-ray diffraction peaks at 6,807, 4,563, 4,416, and 3,503 d(Å), in vacuo at temperatures of 85° to 90° C.