Using COC(=O)C1CS(=O)(=O)CCN1, CC(C)(C)OC(=O)NCC=O to produce COC(=O)C1CS(=O)(=O)CCN1CCNC(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.