1-[({[3-(Azadiazomvinyl)-5-(5-methyl-2,4-dioxo(1,3-dihydropyrimidinyl))oxolan-2-yl]methoxy}(hydroxyphosphoryl)oxy)methyl]-2-hexadecanoyloxyethyl hexadecanoate AIDS-094311 AIDS094311 Dipalmitoyl phosphatidyl AZT Phosphatidyl AZT