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