You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Could you please return a molecule that adheres to this description? The molecule is a organic light-emitting device.
user
CC1(C)c2cc(-c3ccc(-c4nc5ccccc5c5nc6sc7ccccc7n6c45)cc3)ccc2-c2ccc(-c3cccnc3)cc21
assistant