Using O=C=Nc1ccc([N+](=O)[O-])cc1, N[C@@H](CC(=O)O)C(=O)O to produce O=C(O)C[C@H](NC(=O)Nc1ccc([N+](=O)[O-])cc1)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.