Using CCCc1c(OCOC)ccc(C(O)(C(F)(F)F)C(F)(F)F)c1CO to produce CCCc1c(OCOC)ccc2c1COC2(C(F)(F)F)C(F)(F)F, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.