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: The molecule is a phosphorescent that has an effect on low driving voltage.
user
c1ccc2c(-c3nc(-n4c5c6ccccc6ccc5c5c6ccccc6c6c7ccccc7oc6c54)nc4c3oc3ccccc34)cccc2c1
assistant