^Kato N, Oka M, Murase T, Yoshida M, Sakairi M, Yamashita S, et al. (December 2011). "Discovery and pharmacological characterization of N-[2-({2-[(2S)-2-cyanopyrrolidin-1-yl]-2-oxoethyl}amino)-2-methylpropyl]-2-methylpyrazolo[1,5-a]pyrimidine-6-carboxamide hydrochloride (anagliptin hydrochloride salt) as a potent and selective DPP-IV inhibitor". Bioorganic & Medicinal Chemistry. 19 (23): 7221–7. doi:10.1016/j.bmc.2011.09.043. PMID22019046.