4-[(6-{[4-({6-[(4-Carboxy-2,3,5,6-tetrafluorophenyl)diazenyl]-5-hydroxy-7-sulfo(2-naphthyl)}amino)-2,3-dioxocyclobut-1(4)-enyl]amino}-1-hydroxy-3-sulfo(2-naphthyl))diazenyl]-2,3,5,6-tetrafluorobenzoic acid AIDS-104481 AIDS104481