XTORO (finafloxacin otic suspension), 0.3% is a quinolone antimicrobial. Its chemical name is (-)-8-cyano-1-cyclopropyl-6-fluoro-7-[(4aS,7aS)-hexahydropyrrolo[3,4-b]-1,4-oxazin-6(2H)-y]4-oxo-1,4-dihydroquinoline-3-carboxylic acid (CAS number 209342-40-5). Its structural formula is: