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 light-emitting device.
user
c1ccc(-c2nc(-c3ccc(-n4c5ccccc5c5ccccc54)cc3)nc(-c3cccc(-c4ccc5nc(-c6ccccc6)c6cccc(-c7ccccc7)c6c5c4)c3)n2)cc1
assistant