Using O=C1CCC(=O)N1Br, COc1cc2cc(OC(C)=O)nc(C)c2cc1OC to produce COc1cc2cc(OC(C)=O)nc(CBr)c2cc1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.