Using Fc1cccc(CBr)c1F, CCOC(=O)Cc1c(O)nc(S)nc1O to produce CCOC(=O)Cc1c(O)nc(SCc2cccc(F)c2F)nc1O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.