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 high luminous efficiency, light-emitting, and phosphorescent compound. Please represent the molecule in SMILES.
user
CCCc1c(-c2cc(-n3cnc4ccccc43)cc(-n3cnc4ccccc43)c2CCC)cc(-n2ccc3ccccc32)cc1-n1ccc2ccccc21
assistant