Using COc1c(O)c([N+](=O)[O-])c2c(c1[N+](=O)[O-])C(=O)OC2 to produce O=C1OCc2c1c([N+](=O)[O-])c(O)c(O)c2[N+](=O)[O-], please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.