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