Grygoriv, G. V., D. A. Lega, I. A. Zupanets, S. K. Shebeko, S. M. Zimin, I. L. Starchikova, and L. A. Shemchuk. “Spiro[benzo[е]pyrano[3,2-c][1,2]oxathiin-4,3’-Indolil]-3-Carbonitrile 5,5-Dioxides: Synthesis and the Biological Activity Study”. Journal of Organic and Pharmaceutical Chemistry, vol. 17, no. 4(68), Nov. 2019, pp. 53-61, doi:10.24959/ophcj.19.182954.