2,4,6,8-Tetraoxa-5-phosphanonanedioic acid, 5-[[2-(6-amino-9H-purin-9-yl)-1-methylethoxy]methyl]-, bis(1-ethylpropyl) ester, 5-oxide, (R)- 201341-07-3 AIDS-031725 AIDS031725 Bis(3-PentylOC)PMPA PMPA prodrug Tenofovir prodrug