N. Ding, Z. Lu, W. Zhang, Y. Chun, and Y. Li, “Influence of Sugar Residue on the Cytotoxicity and Solubility of Several Aryl-indolo[2,3-a]pyrrolo[3,4-c]carbazoles and the Corresponding Maleimides”, ajc, vol. 25, no. 3, pp. 1397–1400, Oct. 2012.