You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
I give you a description of a molecule, and you need to return one molecule in SMILES that meets the description. The description: The molecule is a organic electroluminescent device and is electroluminescent.
user
c1ccc(-c2nc(-c3ccccc3)nc(-n3c4ccccc4c4ccc5c6cncnc6sc5c43)n2)cc1
assistant