You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Build a molecule that meets the requirement: It belongs to the ccr5 antagonist, ccr2 antagonist, and ccr3 antagonist classes of molecules.
user
COC(=O)C(CCN1CCC2(CC2)C(O)C1)N1CC(C)N(C(=O)OCc2ccccc2)CCC1=O
assistant