AIDS-001506 AIDS001506 GN-28 .beta.-D-Glucopyranose, 1,3,6-tris(3,4,5-trihydroxybenzoate), cyclic 2.2:4.1-ester with (2S)-[(3S,4S)-5-carboxy-3,4-dihydro-3,7,8-trihydroxy-2-oxo-2H-1-benzopyran-4-yl]butanedioic acid .beta.-D-Glucopyranose, cyclic 2,4-ester with 3-(6-carboxy-2,3,4-trihydroxyphenyl)-4-hydroxy-1,2,4-butanetricar- boxylic acid, 1,3,6-tris(3,4,5-trihydroxybenzoate)