In the CH2DNO2 spectrum, a small shoulder arising from the 101121 combination band of the H-eclipsed conformer and the 91131 combination band from the D-staggered conformer appears on the most intense peak. These two bands are combinations of an angular vibration of the NO2 fragment and an angular motion of the CD fragment. A low-intensity band appears from the anharmonic treatment around 3000 cm–1. The main peak of this band, around 2933 cm–1, corresponds to the 4161 combination band from all four conformers. The rest of the features of this band arise from the 11 and 21 fundamental bands of the four conformers. Other low-intensity peaks appear in the anharmonic spectrum around 2738 cm–1 due to the 62 overtone band of the four conformers and around 2462 cm–1 due to the 41111 combination band from the H-eclipsed and D-staggered conformers.