You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
The molecule is a organic electroluminescent material, a organic electroluminescent device, a organic electroluminescent element, and electroluminescent. Use the above information to create a molecule.
user
c1ccc(-c2cc(-c3cccc(-c4ccc5oc6ccccc6c5c4)c3)nc(-n3c4ccccc4c4ccccc43)n2)cc1
assistant