Using CCN(CC)C(=O)[C@@H]1CN(CC(=O)OC)CC[C@@H]1C(=O)OC to produce CCN(CC)C(=O)[C@H]1CN2CC[C@H]1C(=O)C2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.