Using COc1ccc([C@@H](O)[C@H](N)C(=O)OCc2ccccc2)cc1, CC(C)(C)OC(=O)N[C@@H](CO)C(=O)O to produce COc1ccc([C@@H](O)[C@H](NC(=O)[C@H](CO)NC(=O)OC(C)(C)C)C(=O)OCc2ccccc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.