Ketal compound

1-[1-[3-[2-(p-Fluorophenyl)-1,3-dioxolan-2-yl]propyl]-4-piperidyl]-1H-benzimidazole-2(3H)-thione

1-[1-[3-[1,3-dioxolan-2-yl-2-(4-fluorophenyl)]propyl]piperidin-4-yl]-1,3-dihydro-2H-benzimidazole-2-thione