Subunit Chemical Structures (IMAGE) Proceedings of the National Academy of Sciences Caption Subunit chemical structures of the antibiotics PIM1 and PIM1D. Credit Image credit: Wenbin Zhong Usage Restrictions None 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.