Using O=[N+]([O-])O, CCCCn1ccc(=O)c2cnc(-c3ccncc3)nc21 to produce CCCCn1cc([N+](=O)[O-])c(=O)c2cnc(-c3ccncc3)nc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.