Using CC(=O)OC(C)=O, CCOC(=O)[C@H](NC(=O)OCc1ccccc1)[C@@H](O)[C@H]1O[C@@H](OC)[C@@H]2OC(C)(C)O[C@H]12 to produce CCOC(=O)[C@H](NC(=O)OCc1ccccc1)[C@@H](OC(C)=O)[C@@H]1O[C@@H](OC)[C@@H]2OC(C)(C)O[C@H]12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.