You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Come up with a molecule based on the description: The molecule is a organic electroluminescent device and is electroluminescent.
user
O=c1c2ccccc2c2cc(-c3cc(-c4ccc5nc6c(nc5c4)c4cc(-c5cccc(-c7ccccc7)c5)cc5c7ccccc7c(=O)n6c54)cc4c3sc3ccccc34)cc3c4cc(-c5cccc6c5sc5ccccc56)ccc4n1c23
assistant