Abstract The crystal structure of the 1-cyclopropyl-6, 7-difluoro-8-methoxy-4-oxo-1, 4-dihydro- 3-quinoline carboxylic acid-(O3, O4)-bis-(acetate-O) borate has been determined by single crystal X-ray diffraction method. The crystal belongs to monoclinic with space group P2 (1)/n, with a= 16.818 (9), b= 6.585 (4), c= 18.663 (4) Å, a= 90, b= 107.351 (7), g= 90º, V= 1972.8 (18) Å3, Z= 4, Dx= 1.479 Mg/m3, l (MoKa)= 0.128, F (000)= 908, μ (MoKa)= 0.128 mm-1, R ...