AIDS-082137 AIDS082137 Phosphoric acid 5-(2-amino-6-oxo-1,6-dihydro-purin-9-yl)-3,4-dihydroxy-tetrahydro-furan-2-ylmethyl ester 5-(6-amino-purin-9-yl)-4-fluoro-2-hydroxymethyl-tetrahydro-furan-3-yl ester