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