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 phosphorescent.
user
NC1=CC(c2ccc3c4c(cccc24)-c2ccccc2-3)=CCC1
assistant