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