Using COCCCl, COC(=O)C(C)(C1CCc2c([nH]c3ccc(Cl)cc23)C1)S(=O)(=O)c1ccccc1 to produce COCn1c2c(c3cc(Cl)ccc31)CCC(C(C)(C(=O)OC)S(=O)(=O)c1ccccc1)C2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.