Using OC1COC(c2ccccc2)OC1, Fc1cccc(CSc2nc(Cl)cc(Cl)n2)c1F to produce Fc1cccc(CSc2nc(Cl)cc(OC3COC(c4ccccc4)OC3)n2)c1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.