You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
I need a molecule that meets the following conditions: The molecule is a organic light-emitting device. Please represent the molecule in SMILES.
user
c1ccc(-c2cccc(-c3ccc(-c4cc(-c5nc(-c6ccccc6)nc(-c6cccc(-n7c8ccccc8c8cc(-c9ccccc9)ccc87)c6)n5)ccc4-n4c5ccccc5c5ccccc54)cc3)c2)cc1
assistant