Using CC(=O)[O-], O=C(CBr)Nc1cccc(-c2cnc3ccccc3n2)c1 to produce CC(=O)OCC(=O)Nc1cccc(-c2cnc3ccccc3n2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.