Using CC(=O)C(=[N+]=[N-])C(=O)C1CCN(C(=O)OC(C)(C)C)CC1, CO to produce COC(C(C)=O)C(=O)C1CCN(C(=O)OC(C)(C)C)CC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.