You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Suppose there is a molecule that meets the following description: The molecule is a phosphodiesterase inhibitor. Please write the SMILES representation of it.
user
CCOC(=O)N1CCC(NC(=O)c2c[nH]c3c(-c4cc(C)ccc4OCC4CC4)ncnc23)CC1
assistant