2-({6-[(N-{6-[(2-Carboxy-5,6-dimethoxyphenyl)diazenyl]-5-hydroxy-7-sulfo(2-naphthyl)}carbamoyl)carbonylamino]-1-hydroxy-3-sulfo(2-naphthyl)}diazenyl)-3,4-dimethoxybenzoic acid AIDS-104503 AIDS104503