Treatment of 4-methoxy-3-(4-methylpiperazin-1-yl)aniline dihydrochloride (I) with 1,1'-carbonyldiimidazole (II) gave the intermediate imidazolide (III) which, upon treatment with 4-(5-fluoro-1H-indol-3-yl)piperidine (IV) afforded the unsymmetrical urea. Finally, treatment with HCl in acetone yielded the title hydrochloride salt.