Using CCCBr, COC(=O)CCCc1ccc(O)c(-c2cc(CCCC(=O)OC)ccc2O)c1 to produce CCCOc1ccc(CCCC(=O)OC)cc1-c1cc(CCCC(=O)OC)ccc1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.