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 phosphorescent class of molecules.
user
c1cncc(-n2c3ccc(-c4cc5ccccc5cn4)cc3c3c4ccccc4ccc32)c1
assistant