Using COc1ccc(C2OC(=O)[C@H](Cc3ccccc3)N2C(=O)OCc2ccccc2)cc1, ClCBr to produce O=C(N[C@@H](Cc1ccccc1)C(=O)CCl)OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.