Using O=C1CCC(=O)N1Br, COc1ccc(-c2c(C(C)=O)c(C)nc3cc(OC)c(OC)cc23)cc1OC to produce COc1ccc(-c2c(C(C)=O)c(CBr)nc3cc(OC)c(OC)cc23)cc1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.