The molecule is a 1-[6-carboxy-8-(2,4-difluorophenyl)-3-fluoro-5-oxo-5,8-dihydro-1,8-naphthyridin-2-yl]pyrrolidin-3-aminium having S configuration. It is a conjugate acid of a (S)-tosufloxacin. It is an enantiomer of a (R)-tosufloxacin(1+).
[(3S)-1-[6-carboxy-8-(2,4-difluorophenyl)-3-fluoro-5-oxo-1,8-naphthyridin-2-yl]pyrrolidin-3-yl]azanium