Using Cn1c(CO)c(-c2ccc(F)c(F)c2)c2ccccc2c1=O to produce Cn1c(C=O)c(-c2ccc(F)c(F)c2)c2ccccc2c1=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.