Using Brc1ccc2[nH]ccc2c1, O=C1NC(=O)C(=O)C(=O)N1 to produce O=C1NC(=O)C(O)(c2c[nH]c3ccc(Br)cc23)C(=O)N1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.