You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Generate a molecule that fulfills the requirement: The molecule is a phosphodiesterase inhibitor.
user
CCc1nn(CC(C)(C)COC(=O)C2CCOCC2)c2c1C(=O)NCC1(CCOCC1)C2
assistant