Using COC(=O)c1cccc2[nH]c(NCC3CCN(Cc4cc(Cl)cc(Cl)c4O)CC3)nc12 to produce O=C(O)c1cccc2[nH]c(NCC3CCN(Cc4cc(Cl)cc(Cl)c4O)CC3)nc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.