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
CSc1cccc(Oc2ncc(F)cc2C(=O)NC2CCC(NS(=O)(=O)C3=CC=CN4SNC=C34)C(O)C2)c1
assistant