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 pgd2 receptor antagonist.
user
CCC(=O)N(c1ccccc1)C1CC(C)N(C(=O)c2ccc(O)cc2)c2ccccc21
assistant