DETERMINATION OF RELATIVE CONTENTS OF ETHYL 7-CHLORO-1-ETHYL-6-FLUORO-1, 4-DIHYDRO-4-OXOQUINOLINE-3-CARBOXYLATE AND ITS ISOMER BY 1H NMR METHOD
Guo Huiyuan, Gu Huier, Zhang Zhongyue, Sun Lanying
Chinese Journal of Magnetic Resonance . 1987, (3): 229 -231 . 

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