1H-[1,2,4]Triazolo[1,2-a]pyridazine-8-carboxylic acid, 5-(.beta.-D-glucopyranosyloxy)-2,3,5,8-tetrahydro-1,3-dioxo-2-phenyl-, methyl ester, 2',3',4',6'-O-tetraacetate ester AIDS-147316 AIDS147316 NSC676857