1-Methyl-1,4-dihydro-pyridine-3-carboxylic acid (2R,3S,5R)-5-(2,4-dioxo-5-vinyl-3,4-dihydro-2-H-pyrimidin-1-yl)-2-hydroxymethyl-tetrahydro-furan-3-yl ester AIDS-113824 AIDS113824