2',3'-Didehydro-3'-deoxythymidine, 5'-hexyl phosphonate AIDS-185250 AIDS185250 Phosphorous acid hexyl ester 5-(5-methyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-2,5-dihydro-furan-2-ylmethyl ester