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Sitafloxacin is a newly developed fluoro­quinolone anti­bacterial drug. The crystal studied, C 19 H 18 ClF 2 N 3 O 3 ·CH 3 OH, consists of one mol­ecule of sitafloxacin and one methanol solvent mol­ecule. The mol­ecule of sitafloxacin is a zwitterion with a protonated primary amine group and a deprotonated carboxylate group. The cyclopropane ring and the CO 2  group make dihedral angles of 79.5 (3) and 35.4 (4)°, respectively, with the fused ring system. The supra­molecular structure is defined by N—H⋯O and O—H⋯O hydrogen bonds.

acta crystallographica. section e

7-[(7S)-7-Azaniumyl-5-azaspiro[2.4]hept-5-yl]-8-chloro-6-fluoro-1-[(1S,2R)-2-fluorocyclopropyl]-4-oxo-1,4-dihydroquinoline-3-carboxylate methanol monosolvate