AIDS-111813 AIDS111813 [2-(6-Amino-purin-7-yl)-ethoxymethyl]-phosphonic acid, mono-(5-(6-amino-purin-9-yl)-2-{[2-(3,4-dimethoxy-5-oxo-5H-furan-2-ylidene)-ethoxy]-hydroxy-phosphoryloxymethyl}-4-hydroxy-tetrahydro-furan-3-yl) ester