(2R,3R,4R,5R)-5-(5-amino-3-oxo-1,2,4-triazin-2(3H)-yl)-2-(chloromethyl)-4-fluoro-2-((isobutyryloxy)methyl)tetrahydrofuran-3-yl isobutyrate

(2R,3R,4R)-2-(chloromethyl)-5-(3,5-dioxo-4,5-dihydro-1,2,4-triazin-2(3H)-yl)-4-fluoro-2-((isobutyryloxy)methyl)tetrahydrofuran-3-yl isobutyrate

(2R,3R,4R,5R)-2-(chloromethyl)-4-fluoro-2-((isobutyryloxy)methyl)-5-(3-oxo-5-(1H-1,2,4-triazol-1-yl)-1,2,4-triazin-2(3H)-yl)tetrahydrofuran-3-yl isobutyrate