Using Cc1c(S(=O)(=O)Nc2ccc(C3CN(C(=O)OC(C)(C)C)C3)cc2)sc2ccc(Cl)cc12, CI to produce Cc1c(S(=O)(=O)N(C)c2ccc(C3CN(C(=O)OC(C)(C)C)C3)cc2)sc2ccc(Cl)cc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.