You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
I need a molecule that meets the following conditions: It belongs to the pain treatment class of molecules. Please represent the molecule in SMILES.
user
c1ccc(C2Nc3ccc(N4CCOCC4)cc3C3C4CCC(C4)C23)cc1
assistant