Using O=C(O)c1cc(Cl)c(F)cc1F, OC1CCC2(CC1)OCCO2 to produce O=C(O)c1cc(Cl)c(OC2CCC3(CC2)OCCO3)cc1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.