Reactivity of phenylanthranilic acids derivatives. XXIII. Synthesis and acid-base properties of 4,5-dymethoxy-N-(2'-carboxyphenyl)anthranilic acids - S. G. Isaev; O. M. Sviechnikova; A. O. Devyatkina; T. A. Kostina; T. N. Svyatska (Journal of organic and pharmaceutical chemistry, 2013)