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 and is phosphorescent.
user
c1ccc(-c2nc(-c3ccccc3)nc(-c3cccc(N4c5ccccc5-c5ccccc5-c5cc(-c6ccc7c(c6)-c6ccccc6-c6ccccc6N7c6cccc(-c7cccc8c7oc7ccccc78)c6)ccc54)c3)n2)cc1
assistant