... Please enable JavaScript to use all the features on this page. Journal of Fluorine Chemistry. Volume 94, Issue 1, 11 February 1999, Pages 7–10. ... 1) such as norfloxacin (3) and ciprofloxacin (4), are a C-6 fluorine and a C-7 cyclic piperazinyl group 8, 9, 10, 11, 12 and 13. ...