I. V. Ukrainets, L. A. Petrushova, S. P. Dzyubenko, and L. O. Grinevich, “Synthesis and analgesic activity of N-(benzothiazol-2-yl)-4-hydroxy-2,2-dioxo-1H-2λ6,1-benzothiazine-3-carboxamides”, J. Org. Pharm. Chem., vol. 12, no. 4(48), pp. 38–43, Dec. 2014.