1-((2R,5S)-5-(hydroxymethyl)-2,5-dihydrofuran-2-yl)-5-methylpyrimidine-2,4(1H,3H)-dione; 2',3'-Didehydro-3'-deoxythymidine; 3'-Deoxy-2'-thymidinene; 3'-Deoxy-2',3'-didehydrothymidine; Avostav; D4; BMY-27857; Zerit; NSC 163661; Sanilvudine; Virostav; Zidovudine EP Impurity A;