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: >250 °c
user
[Cu].c1ccc2c(c1)C1=NC2=NC2=NC(=NC3=NC(=NC4=NC(=N1)c1ccccc14)c1ccccc13)c1ccccc12
assistant