5-((E)-2-Bromo-vinyl)-1-[(2R,4S,5R)-4-hydroxy-5-(2-oxo-8-phenyl-4H-1,3,2-benzodioxaphosphorin-2-yloxymethyl)-tetrahydro-furan-2-yl]-1H-pyrimidine-2,4-dione, (Rp) AIDS-188481 AIDS188481