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Norfloxacin methanol solvate (1-ethyl-6-fluoro-1,4-dihydro-4-oxo-7-(1-piperazinyl)-3-quinoline carboxylic acid methanol solvate) has been prepared. The crystal and molecular struc- tures of the title compound, C16H18FN3O3·CH3OH·H2O, were determi