Using OCCOCCO, O=[N+]([O-])c1cc2c(cc1[N+](=O)[O-])OCO2 to produce O=[N+]([O-])c1cc(O)c(OCCOCCO)cc1[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.