Using COCc1ccc(-c2cn(-c3cc(C(=O)OC)c([N+](=O)[O-])cc3C(F)(F)F)cn2)cc1 to produce COCc1ccc(-c2cn(-c3cc(C(=O)OC)c(NO)cc3C(F)(F)F)cn2)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.