Phthaloyl Peroxide Crab (image) University of Texas at Austin Caption The crab represents the chemical phthaloyl peroxide. The claws are the reactive regions of the molecule that undergo the reaction. The crab is grabbing a molecule (forming the carbon-oxygen bond) then tearing a hydrogen atom off. Credit Image was created by Mingjun Quan, based on a design by Changxia Yuan. Usage Restrictions None 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.