You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
It belongs to the phosphorescent class of molecules. Use the above information to create a molecule.
user
CCCOc1cnnc(-c2ccc3c(c2)C(C)(C)c2cc(-c4nncc(C)c4OCCC)ccc2-3)c1C
assistant