Using Nc1nc(Cl)cc(Cl)n1, O=C(O)c1cccc2cc(O)ccc12 to produce Nc1nc(Cl)cc(Oc2ccc3c(C(=O)O)cccc3c2)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.