cis(+/-)-4-Chloro-5-ethyl-N-[3-(propylamino)piperidin-4-yl]-1H-imidazole-2-carboxamide trans(+/-)-4-Chloro-5-ethyl-N-[3-(propylamino)piperidin-4-yl]-1H-imidazole-2-carboxamide