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(-c2nnc(-c3ccc(C4=Nc5cnccc5C(c5ccc(-c6nnc(-c7ccccc7)o6)cc5)=Nc5cnccc54)cc3)o2)cc1
assistant