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 phosphorescent. Please represent the molecule in SMILES.
user
c1ccc2c(Cn3c4ccccc4c4ccccc43)ccc(Cn3c4ccccc4c4ccccc43)c2c1
assistant