4-Membered Ring Precursor (IMAGE) University of Vienna Caption The Viennese scientists led by Maulide developed a method employing a 4-membered ring precursor to quickly assemble the macrocycle of the natural products. Credit © Giovanni Di Mauro/Maulide Group Usage Restrictions The image may only be used with appropriate caption or 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.