1-(2-Deoxy-.beta.-D-erythro-pentofuranosyl) uracil & 3'-Azido-3'-deoxythymidine 2'-Deoxyuridine & AZT 2'dU & AZT 2,4(1H,3H)-Pyrimidinedione, 1-(2-deoxy-.beta.-D-erythro-pentofuranosyl)- & Thymidine, 3'-azido-3'-deoxy- AIDS-000878 AIDS000878