Using CCOC(=O)CN1C(=O)[C@@H](NC(=O)OC(C)(C)C)C[C@H]1C to produce C[C@@H]1C[C@H](NC(=O)OC(C)(C)C)C(=O)N1CC(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.