... to a pyrrolin-N-oxyl molecule [2]. The synthesis of this spin-labeled nucleic acid begins with stable nitroxides described by Rozantsev [3]; further elaboration of these ... Molecules 2000, 5 ... Method 5 – To a solution of 1 (1.84 g, 10 mmol) in dry THF (10 mL) was added, dropwise, a ...