2,4(1H,3H)-Pyrimidinedione, 1-[(2R,3R,3aR,5S,7aS)-5-[[(2E)-3-(3,4-dihydro-4-oxo-1,3,2-benzodiazaborin-2(1H)-yl)-2-propen-1-yl]oxy]-3-fluorohexahydro-3-methyl-5-oxido-2H-furo[3,2-d][1,2]oxaphosphorin-2-yl]-