Using O=S(=O)(c1ccccc1)n1cc(-c2cc(Cl)nc(Cl)c2)c2nccnc21 to produce Clc1cc(-c2c[nH]c3nccnc23)cc(Cl)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.