Polymorphic forms of 4,5-dihydro-1h-pyrrolo[2,3-f]quinoline-2,7,9-tricarboxylic acid and its disodium salt, process for their preparation and their use

Abstract

The present disclosure relates to polymorphic form of pqq and / or its salts represented by formula (i), wherein "n" and "m" are selected from a group consisting of: (a) "n" = 3, "m" = 0 and (b) "n" = 1, "m" = 2; and; r3 is na+. The present disclosure also relates to a process for preparing the polymorphic form of compound of formula (i) and / or its salts, a composition comprising the polymorphic form of compound of formula (i) and / or its salts and use thereof.