Siumka, Y.I., Sytnik, K.M., Levashov, D.V., Spychak, T.V., Horiachyi, V.D. and Shemchuk, L.A. 2019. Chemical transformations of new mono- and bis-derivatives of spiroindol-3,3’-pyrrolo[3,4-c]pyrrole based on bis-maleiminides and the study of the microbiological activity of the compounds synthesized. Journal of Organic and Pharmaceutical Chemistry. 17, 4(68) (Nov. 2019), 44–52. DOI:https://doi.org/10.24959/ophcj.19.181138.