Using CCCC(=O)CC(=O)OCC, [N-]=[N+]=Nc1ccc([N+](=O)[O-])cc1 to produce CCCc1c(C(=O)O)nnn1-c1ccc([N+](=O)[O-])cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.