Moxifloxacin Impurity I Catalogue M320369 CAS 139693-52-0 M.W 423.13 M.F C18H16BF2NO8 Specifications FAQs 6-cyclopropyl-8,9-difluoro-7-methoxy-4-oxo-4,6-dihydro-2H-1l3-[1,3]dioxino[5,6-c]quinoline-2,2-diyl diacetate