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
O=C(Nc1ccc2c(c1)OCCCO2)c1ccc(-c2cccc(F)c2)nc1
assistant