Using O=C1CCC(=O)N1Br, COC(=O)[C@H](C)Oc1cc(C)ccc1Cl to produce COC(=O)[C@H](C)Oc1cc(CBr)ccc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.