Using C=CCn1c(-c2ccc(Cl)cc2Br)n[nH]c1=O, COC(=O)CCl to produce C=CCn1c(-c2ccc(Cl)cc2Br)nn(CC(=O)OC)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.