Using O=S(=O)(Cl)Cl, CN1C[C@@H](NC(=O)C(C)(C)C)C=C2c3cccc4[nH]cc(c34)C[C@H]21 to produce CN1C[C@@H](NC(=O)C(C)(C)C)C=C2c3cccc4[nH]c(Cl)c(c34)C[C@H]21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.