1,8-Naphthyridine-3-carboxylic acid, 1-(2,4-difluorophenyl)-6-fluoro-1,4-dihydro-7-[(1R,4R,6S)-6-methyl-2,5-diazabicyclo[2.2.1]hept-2-yl]-4-oxo- AIDS-111231 AIDS111231