Using CCOC(=O)c1c(SCOC)nc2c(Cl)c(F)c(F)cc2c1O to produce CCOC(=O)c1c(S)nc2c(Cl)c(F)c(F)cc2c1O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.