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
COCCOc1cccc(C(=O)NC2CCC(n3c(=O)c4cc(F)cnc4n(C4CCSCC4)c3=O)CC2)c1
assistant