Using Cc1c(CO)nc2c(NC(=O)C(C)(C)C)cccn12, O=S(Cl)Cl to produce Cc1c(CCl)nc2c(NC(=O)C(C)(C)C)cccn12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.