Using O=[N+]([O-])O, COc1cc(C(=O)O)c(C(=O)O)cc1OC to produce COc1cc2c(c([N+](=O)[O-])c1OC)C(=O)OC2=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.