Choline → N,N,N-Trimethyl-N-(2-hydroxyethyl)-ammonium 1-cyclopropyl-6,8-difluoro-7-[3-(1,2,4-triazol-1-yl)pyrrolidin-1-yl]-1,4-dihydro-4-oxoquinoline-3-carboxylate

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To a suspension of 100.25 mg (0.25 mmol) of 1-cyclopropyl-6,8-difluoro-7-[3-(1,2,4-triazol-1-yl) pyrrolidin-1-yl]-1,4-dihydro-4-oxoquinoline-3-carboxylic acid in 0.625 ml of methanol and 0.2 ml of water was added at room temperature slowly 0.075 ml of 45% choline in methanol. The solution was stirred at room temperature for an additional hour and after being through a cotton filter, the supernatant was evaporated to dryness under reduced pressure (30° C.). The residue was crystallized from acetone-methanol and dried to give 85 mg of off white solid, m.p. 193°-194° C. 1H NMR (CD3OD) δ: 8.61 (s, 1H), 8.42 (bs, 1H), 8.01 (s, 1H), 7.76 (dd, 14Hz, 1.8Hz, 1H), 5.3-5.15 (m, 1H), 4.3-3.75 (m, 7H), 3.5-3.44 (m, 2H), 3.21 (s, 9H), 2.62-2.45 (m, 2H), 1.22-1.02 (m, 4H). Anal. calcd. for C24H30F2N6O4H2O: C, 55.16; H, 6.13; N, 16.07. Found: C, 54.46; H, 5.91; N, 15.82.

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