Using Nc1cc(Cl)c(O)c(Cl)c1, Clc1nc2c(Cl)cccc2s1 to produce Nc1cc(Cl)c(Oc2nc3c(Cl)cccc3s2)c(Cl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.