Using N=C(N)N[N+](=O)[O-], CCCCn1ccc(CC(C=O)C(=O)OCC)cc1=O to produce CCCCn1ccc(Cc2cnc(N[N+](=O)[O-])[nH]c2=O)cc1=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.