Using Cn1nc(-c2c(F)cccc2Cl)nc1Cc1ccc(Cl)cc1, O to produce Cn1nc(-c2c(F)cccc2Cl)nc1C(O)c1ccc(Cl)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.