1,8-Naphthyridine-3-carboxylic acid, 1-cyclopropyl-6-fluoro-1,4-dihydro-5-methyl-7-[(1R,3S,4R)-3-methyl-2,5-diazabicyclo[2.2.1]hept-2-yl]-4-oxo- AIDS-111228 AIDS111228