Using CC(C)(C)OC(=O)N1CCN(C(=O)OC(C)(C)C)C(C(O)=C2C(=O)OC(C)(C)OC2=O)C1 to produce CCOC(=O)CC(=O)C1CN(C(=O)OC(C)(C)C)CCN1C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.