Using CC(C)(C)OC(=O)N[C@@H](Cc1cn(C=O)c2ccccc12)C(=O)O, O=C([O-])[O-] to produce COC(=O)[C@H](Cc1cn(C=O)c2ccccc12)NC(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.