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 pde inhibitor.
user
CN1CN2C(Cc3c([nH]c4ccccc34)C2c2ccc3c(c2)OCO3)C(=O)N1C
assistant