AIDS-082133 AIDS082133 Phosphoric acid 5-(2-amino-6-oxo-1,6-dihydro-purin-9-yl)-2-hydroxymethyl-tetrahydro-furan-3-yl ester 5-(2-amino-6-oxo-1,6-dihydro-purin-9-yl)-3-hydroxy-tetrahydro-furan-2-ylmethyl ester