complex biomolecule (IMAGE) Technische Universität Dresden Caption Example of a complex biomolecule from the group of functionalized nucleotides, achieved through the method developed by the Weigand Research Group using conventional phosphoric acid. Credit Weigand Group Usage Restrictions No 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.