You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Build a molecule that meets the requirement: The molecule is a phosphodiesterase inhibitor.
user
COc1ccc(CNc2nnc(N3CCC4(CC3)CC(O)CO4)c3ccc(C#N)cc23)cc1Cl.Cl
assistant