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The crystal structure of two multi-component crystals of ciprofloxacin [systematic name: 1-cyclopropyl-6-fluoro-4-oxo-7-(piperazin-1-yl)quinoline-3-carboxylic acid], a fluoroquinolone antibiotic, namely, ciprofloxacin 2,6-dihydroxybenzoate salt, C 17 H 19 FN 3 O 3 + ·C 7 H 5 O 4 − , (I), and ciprofloxacin hydrochloride–3,5-dihydroxybenzoic–water (1/1/1), C 17 H 19 FN 3 O 3 + ·Cl − ·C 7 H 6 O 4 ·H 2 O, (II), were determined. In (I) and (II), the ciprofloxacin cations are connected  via  head-to-tail N—H...O hydrogen bonding. Both structures show an alternating layered arrangement between ciprofloxacin and dihydroxybenzoic acid.

Ciprofloxacin salt and salt co-crystal with dihydroxybenzoic acids