Using CCOCC, CC(C)(C)OC(=O)N1CC(O)CN1C(=O)OC(C)(C)C to produce COC1CN(C(=O)OC(C)(C)C)N(C(=O)OC(C)(C)C)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.