The title compound [systematic name: 1-cyclopropyl-6-fluoro-4-oxo-7-(piperazin-4-ium-1-yl)-1,4-dihydroquinoline-3-carboxylate methanol hemisolvate], C17H18FN3O3·0.5CH4O, is an antibacterial fluoroquinolone. The molecule exists as a zwitterion in the solid state. The methanol molecule is disordered across a twofold rotation axis.
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Li et al. (2006) studied this question.
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