Electron spin resonance measurements of single crystals of α-aminoisobutyric acid, which are both irradiated and measured at 77 °K, give rise to a strong central absorption line at the center of two weak "satellite" peaks. The species largely responsible for the intensity of the central absorption line has been discussed previously and is considered to be the doubly ionized radical anion. In this paper, evidence is presented which shows that some of the intensity of this central line is contributed by the species giving rise to the satellite lines. Furthermore, this evidence, which is based upon saturation studies, variable temperature measurements, deuteration studies, and complete neglect of differential overlap–self consistent field molecular orbital calculations, suggests that the species giving rise to the satellite spectra is a planar conformation of the radical (CH3)2CCO2H.