Using C[C@H]1CCN(C(=O)OC(C)(C)C)C[C@H]1C(=O)O, C[C@H]1CCNC[C@H]1C(=O)O to produce C[C@H]1CCN(C(=O)OC(C)(C)C)C[C@H]1C(=O)N(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.