Using O=C1NC(=O)c2ccccc21, CC(C)(C)OC(=O)N1CCN(c2nc(F)c(F)cc2F)CC1 to produce CC(C)(C)OC(=O)N1CCN(c2nc(N)c(F)cc2F)CC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.