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
CCOC(=O)c1c(-c2ccccc2)n[nH]c(=O)c1Nc1cccnc1
assistant