(S)-HPMPG 116558-95-3 9-[(2S)-3-Hydroxy-2-phosphonylmethoxylpropyl]guanine AIDS-080923 AIDS080923 Phosphonic acid, [[(1S)-2-(2-amino-1,6-dihydro-6-oxo-9H-purin-9-yl)-1-(hydroxymethyl)ethoxy]methyl]-