Using CCCBr, COC(=O)c1ccc(Cc2c[nH]c3ccc(C=O)cc23)c(OC)c1 to produce CCCn1cc(Cc2ccc(C(=O)OC)cc2OC)c2cc(C=O)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.