Using CC(C)NC(=O)[C@H]1CN(C(=O)OC(C)(C)C)CCN1C(=O)OC(C)(C)C to produce CC(C)NC[C@H]1CN(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.