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
CCOc1ccnc(-c2cnc(N3CC4(COC4)c4ccc(C(=O)N(C)CCO)cc43)nc2)c1
assistant