Guo, A-Rong, Hua-Hong Zhou, Kui-Kui Dong, Kai-Qun Wu, Yu-Liang Wang, and Tian Chen. 2012. “Synthesis and Antibacterial Activities of Pleuromutilin Derivatives With Modified 7-Aminocephalosporin Acid and Thioether Moiety”. Asian Journal of Chemistry 25 (1):397-400. https://doi.org/10.14233/ajchem.2013.13120.