Using O=C(O)c1cc(Cl)c(F)cc1F, NS(=O)(=O)C1CC1 to produce O=C(NS(=O)(=O)C1CC1)c1cc(Cl)c(F)cc1F, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.