(S)-isopropyl 2-(((S)-([1,1′-biphenyl]-4-yloxy)(((2R,3R,4R,5R)-5-(2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)-4-fluoro-3-hydroxy-4-methyltetrahydrofuran-2-yl)methoxy)phosphoryl)amino)propanoate-13CD3