Using C=CCN(CC(=O)c1cccnc1)C(=O)OC(C)(C)C, NO to produce C=CCN(CC(=NO)c1cccnc1)C(=O)OC(C)(C)C, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.