You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Can you create a molecule that matches the given characteristics? The molecule is a phosphodiesterase inhibitor.
user
COc1ccc(-c2ccc3c(c2)COC3=O)c(OCC2(C(=O)OCC(C)C)CCC2)c1OC
assistant