The study of regularities of the structure – analgesic activity relationship in a series of 4-hydroxy-N-(pyridin-2-yl)-2,2-dioxo-1H-2λ6,1-benzothiazine-3-carboxamides - I. V. Ukrainets; L. O. Petrushova; O. V. Gorokhova; O. O. Davydenko (Journal of organic and pharmaceutical chemistry, 2015)