Experimental

R factor = 0.062; wR factor = 0.157; data-to-parameter ratio = 27.3. The five-membered ring of the title compound, C10H14NO, is almost planar [mean deviation from best plane = 0.006 (1) Å]. The N—O bond is in the plane of the five-membered ring. The molecule is positioned about a pseudo-mirror plane at y = 0.375. In the crystal, molecules are connected by inter-molecular C—H O contacts into layers parallel to (010). Related literature For the preparation of the title compound, see: Schiemann et al. (2007). For its application as a spin label, see: Schiemann et al. (2007); Piton et al. (2007). For the crystal structure of a related compound, see: Fritscher et al. (2002)