(S)-2-{[4-(6-Aminopurin-9-yl)-spiro[2.2]pent-1-ylmethoxy]-phenoxyphosphorylamino}-propionic acid methyl ester AIDS-088533 AIDS088533 medial-syn-9-(5'-Hydroxymethylspiropentan-1'-yl)adenine (R,S)-4'-(methylphenylphosphoryl-(P-