Using O=c1c(Cl)c(Cl)cnn1-c1ccc(F)c(F)c1, CCCCO to produce CCCCOc1c(Cl)cnn(-c2ccc(F)c(F)c2)c1=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.