1-环丙基-6,7,8-三氟-4-氧代-1,4-二氢喹啉-3-羧酸 、
2-Piperidin-1-ylmethyl-morpholine 以to give 1-cyclopropyl-6,8-difluoro-1,4-dihydro-4-oxo-7-[2-(piperidinomethyl)morpholino]quinoline-3-carboxylic acid 1/2 hydrate, melting at 160°-162° C.的产率得到1-cyclopropyl-6,8-difluoro-1,4-dihydro-4-oxo-7-[2-(piperidinomethyl)morpholino]quinoline-3-carboxylic acid