Using OCCBr, O=[N+]([O-])c1ccc(Oc2ccnc3cc(O)ccc23)cc1 to produce O=[N+]([O-])c1ccc(Oc2ccnc3cc(OCCO)ccc23)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.