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 a phosphorescent, which is a member of the electroluminescent, organic electroluminescent compound, and high luminous efficiency classes of molecules, and it has effects on both electron transport and low driving voltage. Please represent the molecule in SMILES.
user
CC1(C)c2ccccc2-c2ccc(-c3cc(-c4ccccc4)nc(-c4cc(-n5c6ccccc6c6cc7ccccc7cc65)c5ccccc5c4)n3)cc21
assistant