Stable Spiro‐Fused Diarylaminyl Radicals: A New Type of a Neutral Mixed‐Valence System. - Sentyurin, Vyacheslav V.; Levitskiy, Oleg A.; Bogdanov, Alexey V.; Yankova, Tatiana S.; Dorofeev, Sergey G.; Lyssenko, Konstantin A.; Gontcharenko, Victoria E.; Magdesieva, Tatiana V. (Chemistry - A European Journal, 2023)