Using CC(=O)Br, C=CCN1Cc2c(cc(O)c(O)c2Cl)C(c2ccc(O)cc2)C1 to produce C=CCN1Cc2c(cc(OC(C)=O)c(OC(C)=O)c2Cl)C(c2ccc(OC(C)=O)cc2)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.