2-[(2S,3R,4S,5R,6R)-6-((2R,3S,4R,5R,6R)-4,5-Dihydroxy-2-hydroxymethyl-6-methoxy-tetrahydro-pyran-3-yloxy)-3,4,5-trihydroxy-tetrahydro-pyran-2-ylmethylsulfanyl]-butyric acid AIDS-121744 AIDS121744