(R)-1-(5-methylene-2-tetrahydrofuranyl)thymine

5-methyl-1-[(2R)-5-methylidene-2H-furan-2-yl]pyrimidine-2,4-dione

1-(3,5-anhydro-2-deoxy-β-D-threo-pentofuranosyl)-2-O-ethylthymine

2',3'-didehydro-3'-deoxy-5'-O-(methylsulfonyl)thymidine

3'-O-mesyl-5'-O-tosylthymidine