You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
The molecule is a pde4 inhibitor. Use the above information to create a molecule.
user
CCc1c(C(=O)O)c(OC(F)(F)F)c2nc(N3CC4CCC(C3)N4)oc2c1-c1nccs1
assistant