You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
I give you a description of a molecule, and you need to return one molecule in SMILES that meets the description. The description: The molecule is a pde4 inhibitor.
user
CC1CN(C(=O)OC(C)(C)C)CCN1c1nc2cc(Cl)cc(CO)c2o1
assistant