You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Conceptualize a molecule that meets the specified attribute(s): The molecule is a phosphodiesterase inhibitor.
user
COc1ccc(-c2ccc3c(c2)COC3=O)c(OC(=O)CC(C)C)c1OC
assistant