Using O=C1N[C@@H]2CN(C(=O)OCc3ccccc3)CC[C@@H]2O1, CC(C)(C)OC(=O)OC(=O)OC(C)(C)C to produce CC(C)(C)OC(=O)N1C(=O)O[C@H]2CCN(C(=O)OCc3ccccc3)C[C@H]21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.