You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Generate a molecule that fulfills the requirement: It belongs to the phosphorescent class of molecules.
user
c1ccc(-c2ccc(-c3cc(-c4ccccc4)nc(-n4c5ccccc5c5c6c7ccccc7n(-c7ccc(-c8ccccc8)cc7)c6ccc54)n3)cc2)cc1
assistant