Using NNc1ccccc1, CCOC(=O)CC(=O)c1cc(F)c(F)cc1F to produce O=C1CC(c2cc(F)c(F)cc2F)=NN1c1ccccc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.