Synonyms: 1,8-naphthyridine-3-carboxylic acid, 7-[(3S,4S)-3-amino-4-methyl-1-pyrrolidinyl]-1-(1,1-dimethylethyl)-6-fluoro-1,4-dihydro-4-oxo-, methanesulfonate (1:1);7-[(3S,4S)-3-amino-4-methylpyrrolidin-1-yl]-1-tert-butyl-6-fluoro-4-oxo-1,4-dihydro-1,8-naphthyridine-3-carboxylic acid methanesulfonate (1:1)