Isotopic Isomers (IMAGE) Shibaura Institute of Technology Caption Scientists from SIT, Japan, found that quinazoline-4-thiones with ortho-deuterio-phenyl group possess isotopic atropisomerism based on ortho-H/D discrimination. Credit Osamu Kitagawa from Shibaura Institute of Technology Usage Restrictions Attributions are required. 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.