Figure 2. (IMAGE) Science China Press Caption Single-crystal X-ray structures of [2]catenanes (a), molecular Borromean rings (b) and [3] catenanes (c). Credit ©Science China Press Usage Restrictions Use with credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.