Using O=C(O)C(C1CC1)n1c(-c2ccc(Cl)cc2)nc2cc(F)c(F)cc21 to produce OCC(C1CC1)n1c(-c2ccc(Cl)cc2)nc2cc(F)c(F)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.