They are as circular as a wheel and enclose a space with a diameter of about two nanometers. Researchers at Jacobs University Bremen led by Professor of Chemistry Ulrich Kortz want to use such a cavity of a molecule based on molybdenum and oxygen to be able to transport medically active substances into the body in a targeted manner. The three-year basic research project is funded by the German Research Foundation (DFG) with approximately 230,000 euros.