You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Generate a molecule based on this description: The molecule is a pde4 inhibitor.
user
COC(=O)C1CCC(C(=O)N2CCN(c3ccc(OC)c(OC4CCCC4)c3)CC2Cc2ccccc2)C1
assistant