The chemical conversion (IMAGE) University of Münster Caption The chemical conversion: a four-membered molecular ring (bicyclobutane, BCB) is inserted into a larger ring (thiophene), which is also aromatic. This results in a structurally complex bicyclic ring system. (top: schematic representation; bottom: chemical formulas) Credit University of Münster – Glorius research group Usage Restrictions The use of this image is only permitted in connection with this press release and with reference to the source. License Original 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.