| abstract |
The 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-quinoline carboxylic acid of formula (I), to methods for producing the same, 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-quinoline carboxylic acid of formula (I) by its characteristic X-ray powder diffractogram and its differential thermal diagram. |