Using CSc1c(F)cc(C(C)=O)cc1F, CCOC(=O)C(F)(F)F to produce CSc1c(F)cc(C(=O)CC(=O)C(F)(F)F)cc1F, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.