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 pde4 inhibitor.
user
COc1ccc(N2CCN(C(=O)OC(C)(C)C)C(CN(C)Cc3ccccc3)C2)cc1OC1CCCC1
assistant