QH7W5PWD8L;UNII-QH7W5PWD8L;Orbifloxacin impurity B [EP];188401-01-6;7-((2-Aminopropyl)amino)-1-cyclopropyl-5,6-difluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid;7-(((2R)-2-Aminopropyl)amino)-1-cyclopropyl-5,6-difluoro-4-oxo-1,4-dihydroquinoline-3-carboxylic acid;AT-6445;ORBIFLOXACIN IMPURITY B [EP IMPURITY]