Using CCOC(=O)Cn1c(CCc2cccc(F)c2F)nc(=O)c2sccc21 to produce O=C(O)Cn1c(CCc2cccc(F)c2F)nc(=O)c2sccc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.