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: It belongs to the pain treatment class of molecules.
user
Cn1c(=O)c2c(ncn2CC(=O)Nc2nc(-c3ccc4ccccc4c3)cs2)n(C)c1=O
assistant