Using C=CC(C)(C)C1(O)CCN(C(=O)OC(C)(C)C)C1, CC(=O)O to produce CC(C)(C)OC(=O)N1CCC2(C1)OC(=O)CC2(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.