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: The molecule is a organic light-emitting device.
user
CC1(C)c2ccccc2-c2nc(-c3ccc(-c4ccccn4)cc3)nc(-c3ccc(-c4ccc5c(c4)c4ccccc4n5-c4ccccc4)cc3)c21
assistant