Using COC(=O)C1CCN(C(=O)OC(C)(C)C)CC1, C[C@@H](C=O)NC(=O)OC(C)(C)C to produce COC(=O)C1(C(O)C(C)NC(=O)OC(C)(C)C)CCN(C(=O)OC(C)(C)C)CC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.