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: It belongs to the organic light-emitting device class of molecules.
user
c1ccc(-c2nc(-c3ccc(-n4c5ccccc5c5c6c7c(cc54)c4ccccc4n7-c4ccccc4-c4ccccc4-6)cc3)nc(-c3ccc4ccccc4c3)n2)cc1
assistant