5-Acetylamino-4-hydroxy-2-[2-hydroxy-2-(6-hydroxy-2,2-dimethyl-tetrahydro-furo[2,3-d][1,3]dioxol-5-yl)-ethylsulfanyl]-6-(1,2,3-trihydroxy-propyl)-tetrahydro-pyran-2-carboxylic acid AIDS-211421 AIDS211421