Using O=S(=O)(Cl)Cl, Cc1c2c(cn1C)NC(=O)CN=C2c1ccccc1 to produce Cc1c2c(c(Cl)n1C)NC(=O)CN=C2c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.