Using Oc1ccc(Br)c(C2OCCO2)c1, CCOC(=O)c1ccc(F)cc1OC to produce CCOC(=O)c1ccc(Oc2ccc(Br)c(C3OCCO3)c2)cc1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.