Using Cn1nnnc1SCC1NCCc2cc(O)c(O)cc21, O=C(Cl)OCC(Cl)(Cl)Cl to produce O=C(OCC(Cl)(Cl)Cl)C1NCCc2cc(O)c(O)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.