You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
I give you a description of a molecule, and you need to return one molecule in SMILES that meets the description. The description: The molecule is a pain treatment.
user
Cc1c(-c2ccc3c(c2)CN(C(=O)OC(C)(C)C)C3=O)nnn1-c1cccnc1F
assistant