Kaping, Shunan, et al. “Ultrasound Assisted Synthesis of pyrazolo[1,5-a]pyrimidine-Antipyrine Hybrids and Their Anti-Inflammatory and Anti-Cancer Activities”. European Journal of Chemistry, vol. 11, no. 1, Mar. 2020, pp. 68-79, doi:10.5155/eurjchem.11.1.68-79.1942.