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
CC=C(O)C(CC(=O)c1ccc(OC)c2c1OC1(CCS(=O)(=O)CC1)O2)=C(O)C=N
assistant