Using CC(=O)OC(C)(C)C, O=C(N[C@H](COCc1ccccc1)C(=O)O)OCC1c2ccccc2-c2ccccc21 to produce CC(C)(C)OC(=O)[C@@H](COCc1ccccc1)NC(=O)OCC1c2ccccc2-c2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.