AIDS-104589 AIDS104589 Cephalosporin fluoroquinolonate deriv S-EPCTM [3-[(1-methyl-1H-tetrazol-5-yl)thio)methyl]-2-carboxy-8-oxo-5-thia-1-azabicyclo[4,2,0]oct-2-en-7-yl] ammonium, 1-cyclopropyl-6-fluoro-7-(4-ethyl-piperazin-1-yl]-1,4-dihydro-4-oxo-5-quinoline carboxylate