Using CCOC(=O)Cc1csc(-c2cnn(C(F)F)c2-c2ccc(F)cc2)n1 to produce O=C(O)Cc1csc(-c2cnn(C(F)F)c2-c2ccc(F)cc2)n1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.