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
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.