Using CC(C)(C)OC(=O)[C@@H]1CC(CN)(CC(=O)O)CN1C(=O)OC(C)(C)C to produce CC(C)(C)OC(=O)[C@@H]1CC2(CNC(=O)C2)CN1C(=O)OC(C)(C)C, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.