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
c1cc(-c2cccc3ccccc23)cc(-c2c3ccccc3c(-c3cc4c5ccccc5oc4c4c3sc3ccccc34)c3ccccc23)c1
assistant