4-(4-{[6-({4-[(6-{[4-(3-Carboxypropyl)phenyl]diazenyl}-5-hydroxy-7-sulfo(2-naphthyl))amino]-2,3-dioxocyclobut-1(4)-enyl}amino)-1-hydroxy-3-sulfo-2-naphthyl]diazenyl}phenyl)butanoic acid AIDS-104476 AIDS104476