Using O=C1CCC(=O)CC1, O=Cc1cc(F)c(F)cc1C=O to produce O=C1c2cc3cc(F)c(F)cc3cc2C(=O)c2cc3cc(F)c(F)cc3cc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.