Using CN(C)CCN(c1ccc2c(c1)C(=O)N(CC(=O)OC(C)(C)C)C2=O)S(C)(=O)=O to produce CN(C)CCN(c1ccc2c(c1)C(=O)N(CC(=O)O)C2=O)S(C)(=O)=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.