Using COc1ccc2c(c1F)COCC2=O, CCOC(=O)C(F)(F)F to produce COc1ccc2c(c1F)COC(C(=O)C(F)(F)F)C2=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.