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 light-emitting and phosphorescent.
user
CCC(C)(C)c1cnc(C(C)(CC)CC)nc1C(F)F
assistant