1,8-Naphthyridine-3-carboxylic acid, 1,4-dihydro-7-(3-amino-4-methyl-1-pyrrolidinyl)-1-(1,1-dimethylethyl)-6-fluoro-4-oxo-, (3S-trans)-, monomethanesulfonate 1,8-Naphthyridine-3-carboxylic acid, 7-(3-amino-4-methyl-1-pyrrolidinyl)-1-(1,1-dimethylethyl)-6-fluoro-1,4-dihydro-4-oxo-, (3S-trans)-, monomethanesulfonate 144176-56-7