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 phosphodiesterase inhibitor.
user
CN1CCN(CCN(c2ccc(C(=O)OCC(=O)OC(Cc3c(Cl)c[n+]([O-])cc3Cl)c3ccc(OC(F)F)c(OCC4CC4)c3)cc2OCC2CC2)S(C)(=O)=O)CC1
assistant