Using COS(=O)(=O)OC, CCOC(=O)c1cn2c3c(c(F)c(F)cc3c1=O)CCN2 to produce COC(=O)c1cn2c3c(c(F)c(F)cc3c1=O)CCN2C, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.