1,2,4-Triazine-3,5(2H,4H)-dione, 2-[2,5-dihydro-5-(hydroxymethyl)-2-furanyl]-, (2R-cis)- 129454-18-8 2',3'-Didehydro-2',3'-dideoxy-6-azauridine 6-Aza-D4U AIDS-001330 AIDS001330