3-((benzyloxy)methyl)-1-((3a'R,4'R,6'R,6a'R)-4'-((S)-1-hydroxyprop-2-yn-1-yl)tetrahydrospiro[cyclopentane-1,2'-furo[3,4-d][1,3]dioxol]-6'-yl)pyrimidine-2,4(1H,3H)-dione

(2R,3R,4R,5R)-2-(azidomethyl)-5-(((S)-1-((3a'R,4'R,6'R,6a'R)-4'-(3-((benzyloxy)methyl)-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)tetrahydrospiro[cyclopentane-1,2'-furo[3,4-d][1,3]dioxol]-6'-yl)prop-2-yn-1-yl)oxy)tetrahydrofuran-3,4-diyl dibenzoate