Using CNC(=O)c1cc(S(=O)(=O)c2ccccc2)cc2c3c(oc12)CCN(C(=O)OC(C)(C)C)C3 to produce CNC(=O)c1cc(S(=O)(=O)c2ccccc2)cc2c3c(oc12)CCNC3, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.