Using CC(C)(C)OC(=O)N1CCC(c2cc(Cl)nc(N3CCC(F)(F)C3)c2)CC1, O=C1COC1 to produce FC1(F)CCN(c2cc(C3CCN(C4COC4)CC3)cc(Cl)n2)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.