Using CC(C)(C)OC(=O)c1c(N)sc2c1CC(CN1C(=O)c3ccccc3C1=O)OC2 to produce CC(C)(C)OC(=O)c1c(N)sc2c1CC(CN)OC2, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.