5-[6-(3,5-Dimethylphenylthio)-5-ethyl-2,4-dioxo(1,3-dihydropyrimidinyl)]-N-[12-(2-{1-[5-(hydroxymethyl)oxolan-2-yl]-2-oxohydropyrimidin-4-yl}hydrazino)dodecyl]pentanamide AIDS-085091 AIDS085091 ddC-HEPT Conjugate