Using O=S(=O)(Cl)Cl, CC(C)CN1C(=O)N(C)C2(NC(=O)NC2=O)c2ccccc21 to produce CC(C)CN1C(=O)N(C)C2(NC(=O)NC2=O)c2cc(Cl)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.