S. J. Saida, M. Muthuchamy, M. Kaliyaperumal, C. S. Rumalla, R. Yanaka, and S. V. Rao, “Isolation and Spectral Characterization of Degradation Impurity in Perampanel Drug Substance Using UPLC-MS and NMR Spectroscopy: Validation of Assay Method by UPLC”, ajc, vol. 30, no. 10, pp. 2215–2219, Aug. 2018.