113852-36-1 9-[(2-R/S)-3-Hydroxy-2-phosphonylmethoxylpropyl]guanine AIDS-001041 AIDS001041 HPMPG Phosphonic acid, [[2-(2-amino-1,6-dihydro-6-oxo-9H-purin-9-yl)-1-(hydroxymethyl)ethoxy]methyl]-, (1)-