You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Build a molecule that meets the requirement: It belongs to the organic light-emitting device class of molecules.
user
c1ccc(-c2nc3cccnc3c3nc(-c4ccc(-c5ccc(-c6nnc(-c7ccccc7)n6-c6ccccc6)cc5)cc4)n(-c4ccccc4)c23)cc1
assistant