Using CCCC(Br)Oc1ccc(OC)cc1, COC(=O)c1ccc(O)cc1C(=O)OC to produce COC(=O)c1ccc(OCCCCOc2ccc(OC)cc2)cc1C(=O)OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.