.alpha.-L-Talofuranuronic acid, 5-[(2-amino-1-oxopropyl)amino]-1,5-dideoxy-1-(3,4-dihydro-2,4-dioxo-1(2H)-pyrimidinyl)-, (S)- 1-[5'-(L-Alanylamino)-5'-deoxy-.alpha.-L-talofuranosyluronic acid]uracil 93806-79-2 AIDS-008575 AIDS008575 L-alanyl UPOC analog