You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Give me a molecule that satisfies the conditions outlined in the description: The molecule is a phosphodiesterase inhibitor.
user
O=S1CCc2nc(N3CC(c4ccc(F)cc4)C3)nc(NC34CC(C3)C4)c21
assistant