You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
I give you a description of a molecule, and you need to return one molecule in SMILES that meets the description. The description: The molecule is a phosphodiesterase inhibitor.
user
Cc1[nH]c2c(-c3cc(C(F)F)ccc3OCC3CC3)ncnc2c1C(=O)NC1CCCCC1O
assistant