You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Can you create a molecule that matches the given characteristics? The molecule is a fluorescent and a organic electroluminescent device, belonging to the electroluminescent class, which has effects on both electroluminescent device and luminous efficiency, and is characterized as phosphorescent.
user
O=C(O)c1ccc(Br)cc1C(=O)c1ccc2c3ccccc3c3ccccc3c2c1
assistant