Using Oc1c(Br)cc(-c2c3ccccc3c(Br)c3oc4ccccc4c23)cc1Br, COC(=O)CBr to produce COC(=O)COc1c(Br)cc(-c2c3ccccc3c(Br)c3oc4ccccc4c23)cc1Br, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.