3-D Structures (image) Swiss Federal Laboratories for Materials Science and Technology (EMPA) Share Print E-Mail Caption The exact three-dimensional structures of various stereoisomers of HBCDs were determined by illuminating the crystals with x-rays. Here, for example, is the structure of (+) alpha HBCD which does not biodegrade well in the environment. Credit Empa Usage Restrictions Use only with credit 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.