Using Oc1ccc(Br)cc1C(O)c1ccccn1, O=C(OO)c1cccc(Cl)c1 to produce [O-][n+]1ccccc1C(O)c1cc(Br)ccc1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.