Compounds having stable isotopes 13C andor 2H were synthesized from precursor compositions having solid phase supports or affinity tags. A stabilizing member is connected to the first connection tip. The liquid is taken to a reservoir that has an electric resistance, which, at the same time, is connected to a filling tube that uses a valve to allow the tank to be filled again so the user may fill the tank with the high-density saline solution each time it takes a bath.