“…-fluoroquinolonic acid (Ciprofloxacin impurity A), EP CRS; 1 ICH, Q3B(R) Impurities in Drug Products (Nov. 2003). 2 FDA, Guidance for Industry -ANDAs: Impurities in Drug Substances (Rockville, MD, Jan. 2005). 3 ICH, Q3A(R) Impurities in New Drug Substances (Feb. 2003).…”