10c Polycyclic Hydrocarbon (image) Hokkaido University Share Print E-Mail Caption This is the chemical structure of the compound which showed the longest C-C bond. Credit Ishigaki Y. et al., Chem, March 8, 2018. Usage Restrictions This image is copyrighted and can be used for reporting this press release if properly credited. Share Print E-Mail 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.