.Beta.-D-Glucopyranoside, 1,4a,5, 7a-tetrahydro-5-hydroxy-7- {(hydroxymethyl)cyclopenta[c]pyran-1-yl,} {[1S-(1.alpha.,4a.alpha.,5.alpha.,7a.alpha)]-} 5-Hydroxy-7-(hydroxymethyl)-1,4a,5,7a-tetrahydrocyclopenta[c]pyran-1-yl hexopyranoside AIDS-160791 AIDS160791 Aucubin NSC648500