Using COc1c(COc2ccc(-c3ccc(Br)cc3)cc2)ccc[n+]1[O-] to produce O=c1c(COc2ccc(-c3ccc(Br)cc3)cc2)cccn1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.