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 pain treatment.
user
CCCCOc1ccccc1-c1cc(-c2n[nH]c(C)n2)ccc1F
assistant