3'-Azido-2',3'-dideoxyuridine 3'-Azido-ddU 3'-N3ddU 84472-85-5 AIDS-000002 AIDS000002 AZDDU AZDU AzddUrd CS 87 CS-087 CS-87 NSC380882 Novuridine Uravidine Uridine, 3'-azido-2',3'-dideoxy-