Sun, Guo-Xin, and Yan-Qing Miao. “Synthesis, Molecular Structure and Antibacterial Activity of Spiro[2,2’]indane-1’,3’-Dione-3-(o-chloro)phenyl-4-Nitro Pyrrolizidine”. Asian Journal of Chemistry, vol. 27, no. 9, May 2015, pp. 3263-6, doi:10.14233/ajchem.2015.18519.