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
O=C(OCc1ccccc1)N1CCc2c([nH]c3ccccc23)C1c1ccc2c(c1)CCO2
assistant