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 ccr1 antagonist.
user
CC1c2nn(-c3ccc(F)cc3)c3c2N(C(=O)C1N)C(C)CC3
assistant