Using CCOC(=O)CCCN1CCN(CC(=O)OC(C)(C)C)CCN(CC(=O)OC(C)(C)C)CC1 to produce O=C(O)CCCN1CCN(CC(=O)O)CCN(CC(=O)O)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.