AIDS-153790 AIDS153790 Methyl 7-((tert-butyl(dimethyl)silyl)oxy)-4-(((tert-butyl(dimethyl)silyl)oxy)methyl)-6-(5-methyl-2,4-dioxo-3,4-dihydro-1(2H)-pyrimidinyl)-1,5-dioxaspiro[2.4]heptane-2-carboxylate NSC706089