CRYSTAL MODIFICATION B OF 8-CYANO-1-CYCLOPROPYL-7-(1S,6S-2,8-DIAZABICYCLO[4.3.0]NONAN-8-YL)-6-FLUORO-1,4-DIHYDRO-4-OXO-3-QUINOLINE CARBOXYLIC ACID, PROCESS FOR ITS PREPARATION AND PHARMACEUTICAL COMPOSITIONS THEREOF
The present invention relates to a defined crystal modification of 8-cyano-1-cyclopropyl-7-(1S,6S-2,8-diazabicyclo[4.3.0]nonan-8-yl)-6-fluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid of the formula (I), to processes for its preparation and to its use in pharmaceutical preparations.The crystal modification can be distinguished from other crystal modifications of 8-cyano-1-cyclopropyl-7-(1S,6S-2,8-diazabicyclo[4.3.0]nonan-8-yl)-6-fluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid of the formula (I) by its characteristic X-ray powder diffractogram and its differential thermodiagram (see description).
