3-喹啉羧酸,6,8-二氯-1-环丙基-7-氟-1,4-二氢-4-羰基- 、
2-甲基哌嗪 以to give 6,8-dichloro-1cyclopropyl-1,4-dihydro-7-(3-methyl-1-piperazinyl)-4-oxo-3-quinolinecarboxylic acid of melting point 288°-291° C. (with decomposition)的产率得到6,8-dichloro-1cyclopropyl-1,4-dihydro-7-(3-methyl-1-piperazinyl)-4-oxo-3-quinolinecarboxylic acid